3251557257491 has 2 divisors, whose sum is σ = 3251557257492. Its totient is φ = 3251557257490.

The previous prime is 3251557257451. The next prime is 3251557257497. The reversal of 3251557257491 is 1947527551523.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3251557257491 is a prime.

It is not a weakly prime, because it can be changed into another prime (3251557257497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1625778628745 + 1625778628746.

It is an arithmetic number, because the mean of its divisors is an integer number (1625778628746).

Almost surely, 2^{3251557257491} is an apocalyptic number.

3251557257491 is a deficient number, since it is larger than the sum of its proper divisors (1).

3251557257491 is an equidigital number, since it uses as much as digits as its factorization.

3251557257491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13230000, while the sum is 56.

The spelling of 3251557257491 in words is "three trillion, two hundred fifty-one billion, five hundred fifty-seven million, two hundred fifty-seven thousand, four hundred ninety-one".