57261861 has 6 divisors (see below), whose sum is σ = 82711590. Its totient is φ = 38174568.

The previous prime is 57261823. The next prime is 57261901. The reversal of 57261861 is 16816275.

57261861 is a `hidden beast` number, since 572 + 6 + 1 + 86 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 29224836 + 28037025 = 5406^2 + 5295^2 .

It is not a de Polignac number, because 57261861 - 2¹⁰ = 57260837 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57261811) 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, 3181206 + ... + 3181223.

It is an arithmetic number, because the mean of its divisors is an integer number (13785265).

Almost surely, 2^57261861 is an apocalyptic number.

It is an amenable number.

57261861 is a deficient number, since it is larger than the sum of its proper divisors (25449729).

57261861 is a wasteful number, since it uses less digits than its factorization.

57261861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6362435 (or 6362432 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 57261861 is about 7567.1567315604. The cubic root of 57261861 is about 385.4385534952.

The spelling of 57261861 in words is "fifty-seven million, two hundred sixty-one thousand, eight hundred sixty-one".