57211631 has 2 divisors, whose sum is σ = 57211632. Its totient is φ = 57211630.

The previous prime is 57211621. The next prime is 57211639. The reversal of 57211631 is 13611275.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57211631 is a prime.

It is a super-2 number, since 2×57211631² = 6546341443360322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57211631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57211639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28605815 + 28605816.

It is an arithmetic number, because the mean of its divisors is an integer number (28605816).

Almost surely, 2^57211631 is an apocalyptic number.

57211631 is a deficient number, since it is larger than the sum of its proper divisors (1).

57211631 is an equidigital number, since it uses as much as digits as its factorization.

57211631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 26.

The square root of 57211631 is about 7563.8370553576. The cubic root of 57211631 is about 385.3258185265.

The spelling of 57211631 in words is "fifty-seven million, two hundred eleven thousand, six hundred thirty-one".