53439481 has 4 divisors (see below), whose sum is σ = 53465764. Its totient is φ = 53413200.

The previous prime is 53439473. The next prime is 53439487. The reversal of 53439481 is 18493435.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47485881 + 5953600 = 6891^2 + 2440^2 .

It is a cyclic number.

It is not a de Polignac number, because 53439481 - 2³ = 53439473 is a prime.

It is a super-2 number, since 2×53439481² = 5711556259098722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53439481.

It is not an unprimeable number, because it can be changed into a prime (53439487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9810 + ... + 14251.

It is an arithmetic number, because the mean of its divisors is an integer number (13366441).

Almost surely, 2^53439481 is an apocalyptic number.

It is an amenable number.

53439481 is a deficient number, since it is larger than the sum of its proper divisors (26283).

53439481 is a wasteful number, since it uses less digits than its factorization.

53439481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26282.

The product of its digits is 51840, while the sum is 37.

The square root of 53439481 is about 7310.2312548920. The cubic root of 53439481 is about 376.6639680109.

The spelling of 53439481 in words is "fifty-three million, four hundred thirty-nine thousand, four hundred eighty-one".