131521393 has 2 divisors, whose sum is σ = 131521394. Its totient is φ = 131521392.

The previous prime is 131521387. The next prime is 131521433. The reversal of 131521393 is 393125131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124166449 + 7354944 = 11143^2 + 2712^2 .

It is a cyclic number.

It is not a de Polignac number, because 131521393 - 2⁵ = 131521361 is a prime.

It is not a weakly prime, because it can be changed into another prime (131521373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65760696 + 65760697.

It is an arithmetic number, because the mean of its divisors is an integer number (65760697).

Almost surely, 2^131521393 is an apocalyptic number.

It is an amenable number.

131521393 is a deficient number, since it is larger than the sum of its proper divisors (1).

131521393 is an equidigital number, since it uses as much as digits as its factorization.

131521393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2430, while the sum is 28.

The square root of 131521393 is about 11468.2776823724. The cubic root of 131521393 is about 508.5482138986.

The spelling of 131521393 in words is "one hundred thirty-one million, five hundred twenty-one thousand, three hundred ninety-three".