57111261 has 4 divisors (see below), whose sum is σ = 76148352. Its totient is φ = 38074172.

The previous prime is 57111247. The next prime is 57111281. The reversal of 57111261 is 16211175.

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 not a de Polignac number, because 57111261 - 2⁷ = 57111133 is a prime.

It is a super-2 number, since 2×57111261² = 6523392266020242, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57111281) 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, 9518541 + ... + 9518546.

It is an arithmetic number, because the mean of its divisors is an integer number (19037088).

Almost surely, 2^57111261 is an apocalyptic number.

It is an amenable number.

57111261 is a deficient number, since it is larger than the sum of its proper divisors (19037091).

57111261 is a wasteful number, since it uses less digits than its factorization.

57111261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19037090.

The product of its digits is 420, while the sum is 24.

The square root of 57111261 is about 7557.1992828031. The cubic root of 57111261 is about 385.1003527686.

The spelling of 57111261 in words is "fifty-seven million, one hundred eleven thousand, two hundred sixty-one".