57261397 has 4 divisors (see below), whose sum is σ = 57296800. Its totient is φ = 57225996.

The previous prime is 57261361. The next prime is 57261401. The reversal of 57261397 is 79316275.

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 a de Polignac number, because none of the positive numbers 2^k-57261397 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 (57262397) 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, 15153 + ... + 18550.

It is an arithmetic number, because the mean of its divisors is an integer number (14324200).

Almost surely, 2^57261397 is an apocalyptic number.

It is an amenable number.

57261397 is a deficient number, since it is larger than the sum of its proper divisors (35403).

57261397 is a wasteful number, since it uses less digits than its factorization.

57261397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35402.

The product of its digits is 79380, while the sum is 40.

The square root of 57261397 is about 7567.1260726910. The cubic root of 57261397 is about 385.4375124068.

The spelling of 57261397 in words is "fifty-seven million, two hundred sixty-one thousand, three hundred ninety-seven".