52139957 has 4 divisors (see below), whose sum is σ = 52236876. Its totient is φ = 52043040.

The previous prime is 52139953. The next prime is 52139963. The reversal of 52139957 is 75993125.

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 30924721 + 21215236 = 5561^2 + 4606^2 .

It is a cyclic number.

It is not a de Polignac number, because 52139957 - 2² = 52139953 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52139953) 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, 47648 + ... + 48729.

It is an arithmetic number, because the mean of its divisors is an integer number (13059219).

Almost surely, 2^52139957 is an apocalyptic number.

It is an amenable number.

52139957 is a deficient number, since it is larger than the sum of its proper divisors (96919).

52139957 is an equidigital number, since it uses as much as digits as its factorization.

52139957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96918.

The product of its digits is 85050, while the sum is 41.

The square root of 52139957 is about 7220.8003019056. The cubic root of 52139957 is about 373.5856817683.

The spelling of 52139957 in words is "fifty-two million, one hundred thirty-nine thousand, nine hundred fifty-seven".