131251597 has 4 divisors (see below), whose sum is σ = 131548320. Its totient is φ = 130954876.

The previous prime is 131251559. The next prime is 131251633. The reversal of 131251597 is 795152131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 795152131 = 29 ⋅27419039.

It is a cyclic number.

It is not a de Polignac number, because 131251597 - 2²³ = 122862989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131251517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147697 + ... + 148582.

It is an arithmetic number, because the mean of its divisors is an integer number (32887080).

Almost surely, 2^131251597 is an apocalyptic number.

It is an amenable number.

131251597 is a deficient number, since it is larger than the sum of its proper divisors (296723).

131251597 is an equidigital number, since it uses as much as digits as its factorization.

131251597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296722.

The product of its digits is 9450, while the sum is 34.

The square root of 131251597 is about 11456.5089359717. The cubic root of 131251597 is about 508.2002395863.

The spelling of 131251597 in words is "one hundred thirty-one million, two hundred fifty-one thousand, five hundred ninety-seven".