57261291 has 4 divisors (see below), whose sum is σ = 76348392. Its totient is φ = 38174192.

The previous prime is 57261289. The next prime is 57261299. The reversal of 57261291 is 19216275.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 57261291 - 2¹ = 57261289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57261299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9543546 + ... + 9543551.

It is an arithmetic number, because the mean of its divisors is an integer number (19087098).

Almost surely, 2^57261291 is an apocalyptic number.

57261291 is a deficient number, since it is larger than the sum of its proper divisors (19087101).

57261291 is a wasteful number, since it uses less digits than its factorization.

57261291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19087100.

The product of its digits is 7560, while the sum is 33.

The square root of 57261291 is about 7567.1190687077. The cubic root of 57261291 is about 385.4372745712.

The spelling of 57261291 in words is "fifty-seven million, two hundred sixty-one thousand, two hundred ninety-one".