53439106561 has 3 divisors (see below), whose sum is σ = 53439337731. Its totient is φ = 53438875392.

The previous prime is 53439106459. The next prime is 53439106579. The reversal of 53439106561 is 16560193435.

It is a happy number.

The square root of 53439106561 is 231169.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16560193435 = 5 ⋅3312038687.

It can be written as a sum of positive squares in only one way, i.e., 4261608961 + 49177497600 = 65281^2 + 221760^2 .

It is not a de Polignac number, because 53439106561 - 2¹⁹ = 53438582273 is a prime.

It is a super-2 number, since 2×53439106561² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53439104561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 115585 + ... + 346753.

It is an arithmetic number, because the mean of its divisors is an integer number (17813112577).

Almost surely, 2^53439106561 is an apocalyptic number.

53439106561 is the 231169-th square number.

53439106561 is the 115585-th centered octagonal number.

It is an amenable number.

53439106561 is a deficient number, since it is larger than the sum of its proper divisors (231170).

53439106561 is an frugal number, since it uses more digits than its factorization.

53439106561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462338 (or 231169 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 43.

Adding to 53439106561 its reverse (16560193435), we get a palindrome (69999299996).

It can be divided in two parts, 53439 and 106561, that added together give a 4-th power (160000 = 20⁴).

The spelling of 53439106561 in words is "fifty-three billion, four hundred thirty-nine million, one hundred six thousand, five hundred sixty-one".