57621911 has 2 divisors, whose sum is σ = 57621912. Its totient is φ = 57621910.

The previous prime is 57621853. The next prime is 57621919. The reversal of 57621911 is 11912675.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 57621911 - 2²² = 53427607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57621919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28810955 + 28810956.

It is an arithmetic number, because the mean of its divisors is an integer number (28810956).

Almost surely, 2^57621911 is an apocalyptic number.

57621911 is a deficient number, since it is larger than the sum of its proper divisors (1).

57621911 is an equidigital number, since it uses as much as digits as its factorization.

57621911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3780, while the sum is 32.

The square root of 57621911 is about 7590.9097610234. The cubic root of 57621911 is about 386.2447171664.

The spelling of 57621911 in words is "fifty-seven million, six hundred twenty-one thousand, nine hundred eleven".