61350831481 has 3 divisors (see below), whose sum is σ = 61351079173. Its totient is φ = 61350583790.

The previous prime is 61350831473. The next prime is 61350831517. The reversal of 61350831481 is 18413805316.

It is a happy number.

The square root of 61350831481 is 247691.

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.

It is not a de Polignac number, because 61350831481 - 2³ = 61350831473 is a prime.

It is a super-2 number, since 2×61350831481² (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 (61350831401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 123846 + ... + 371536.

Almost surely, 2^61350831481 is an apocalyptic number.

61350831481 is the 247691-st square number.

61350831481 is the 123846-th centered octagonal number.

It is an amenable number.

61350831481 is a deficient number, since it is larger than the sum of its proper divisors (247692).

61350831481 is an frugal number, since it uses more digits than its factorization.

61350831481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495382 (or 247691 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 61350831481 in words is "sixty-one billion, three hundred fifty million, eight hundred thirty-one thousand, four hundred eighty-one".