57555261 has 12 divisors (see below), whose sum is σ = 83252988. Its totient is φ = 38315904.

The previous prime is 57555247. The next prime is 57555287. The reversal of 57555261 is 16255575.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21483225 + 36072036 = 4635^2 + 6006^2 .

It is not a de Polignac number, because 57555261 - 2⁵ = 57555229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57550261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2821 + ... + 11093.

It is an arithmetic number, because the mean of its divisors is an integer number (6937749).

Almost surely, 2^57555261 is an apocalyptic number.

It is an amenable number.

57555261 is a deficient number, since it is larger than the sum of its proper divisors (25697727).

57555261 is a wasteful number, since it uses less digits than its factorization.

57555261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9052 (or 9049 counting only the distinct ones).

The product of its digits is 52500, while the sum is 36.

The square root of 57555261 is about 7586.5183714270. The cubic root of 57555261 is about 386.0957394490.

The spelling of 57555261 in words is "fifty-seven million, five hundred fifty-five thousand, two hundred sixty-one".