52156621 has 4 divisors (see below), whose sum is σ = 56898144. Its totient is φ = 47415100.

The previous prime is 52156613. The next prime is 52156627. The reversal of 52156621 is 12665125.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 52156621 - 2³ = 52156613 is a prime.

It is a super-2 number, since 2×52156621² = 5440626228275282, 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 52156621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52156627) 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, 2370745 + ... + 2370766.

It is an arithmetic number, because the mean of its divisors is an integer number (14224536).

Almost surely, 2^52156621 is an apocalyptic number.

It is an amenable number.

52156621 is a deficient number, since it is larger than the sum of its proper divisors (4741523).

52156621 is a wasteful number, since it uses less digits than its factorization.

52156621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4741522.

The product of its digits is 3600, while the sum is 28.

The square root of 52156621 is about 7221.9540984418. The cubic root of 52156621 is about 373.6254770236.

The spelling of 52156621 in words is "fifty-two million, one hundred fifty-six thousand, six hundred twenty-one".