52421157 has 6 divisors (see below), whose sum is σ = 75719462. Its totient is φ = 34947432.

The previous prime is 52421147. The next prime is 52421189. The reversal of 52421157 is 75112425.

It can be written as a sum of positive squares in only one way, i.e., 40373316 + 12047841 = 6354^2 + 3471^2 .

It is not a de Polignac number, because 52421157 - 2⁴ = 52421141 is a prime.

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 52421157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52421107) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2912278 + ... + 2912295.

Almost surely, 2^52421157 is an apocalyptic number.

It is an amenable number.

52421157 is a deficient number, since it is larger than the sum of its proper divisors (23298305).

52421157 is a wasteful number, since it uses less digits than its factorization.

52421157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5824579 (or 5824576 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 52421157 is about 7240.2456450040. The cubic root of 52421157 is about 374.2560825407.

The spelling of 52421157 in words is "fifty-two million, four hundred twenty-one thousand, one hundred fifty-seven".