53439931 has 4 divisors (see below), whose sum is σ = 53455864. Its totient is φ = 53424000.

The previous prime is 53439929. The next prime is 53439941. The reversal of 53439931 is 13993435.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13993435 = 5 ⋅2798687.

It is a cyclic number.

It is not a de Polignac number, because 53439931 - 2¹ = 53439929 is a prime.

It is a super-2 number, since 2×53439931² = 5711652450569522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53439901) 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, 765 + ... + 10366.

It is an arithmetic number, because the mean of its divisors is an integer number (13363966).

Almost surely, 2^53439931 is an apocalyptic number.

53439931 is a deficient number, since it is larger than the sum of its proper divisors (15933).

53439931 is a wasteful number, since it uses less digits than its factorization.

53439931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15932.

The product of its digits is 43740, while the sum is 37.

The square root of 53439931 is about 7310.2620336073. The cubic root of 53439931 is about 376.6650252711.

The spelling of 53439931 in words is "fifty-three million, four hundred thirty-nine thousand, nine hundred thirty-one".