57216491 has 2 divisors, whose sum is σ = 57216492. Its totient is φ = 57216490.

The previous prime is 57216469. The next prime is 57216499. The reversal of 57216491 is 19461275.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 57216491 - 2²² = 53022187 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (57216499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28608245 + 28608246.

It is an arithmetic number, because the mean of its divisors is an integer number (28608246).

Almost surely, 2^57216491 is an apocalyptic number.

57216491 is a deficient number, since it is larger than the sum of its proper divisors (1).

57216491 is an equidigital number, since it uses as much as digits as its factorization.

57216491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 35.

The square root of 57216491 is about 7564.1583140492. The cubic root of 57216491 is about 385.3367290728.

The spelling of 57216491 in words is "fifty-seven million, two hundred sixteen thousand, four hundred ninety-one".