57621631 has 2 divisors, whose sum is σ = 57621632. Its totient is φ = 57621630.

The previous prime is 57621607. The next prime is 57621649. The reversal of 57621631 is 13612675.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 57621631 - 2¹⁹ = 57097343 is a prime.

It is a super-2 number, since 2×57621631² = 6640504718200322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 57621593 and 57621602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57627631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28810815 + 28810816.

It is an arithmetic number, because the mean of its divisors is an integer number (28810816).

Almost surely, 2^57621631 is an apocalyptic number.

57621631 is a deficient number, since it is larger than the sum of its proper divisors (1).

57621631 is an equidigital number, since it uses as much as digits as its factorization.

57621631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 31.

The square root of 57621631 is about 7590.8913178888. The cubic root of 57621631 is about 386.2440915439.

The spelling of 57621631 in words is "fifty-seven million, six hundred twenty-one thousand, six hundred thirty-one".