131256491 has 2 divisors, whose sum is σ = 131256492. Its totient is φ = 131256490.

The previous prime is 131256481. The next prime is 131256509. The reversal of 131256491 is 194652131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131256491 - 2²⁶ = 64147627 is a prime.

It is not a weakly prime, because it can be changed into another prime (131256431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65628245 + 65628246.

It is an arithmetic number, because the mean of its divisors is an integer number (65628246).

Almost surely, 2^131256491 is an apocalyptic number.

131256491 is a deficient number, since it is larger than the sum of its proper divisors (1).

131256491 is an equidigital number, since it uses as much as digits as its factorization.

131256491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 32.

The square root of 131256491 is about 11456.7225243522. The cubic root of 131256491 is about 508.2065559566.

The spelling of 131256491 in words is "one hundred thirty-one million, two hundred fifty-six thousand, four hundred ninety-one".