131320601521 has 4 divisors (see below), whose sum is σ = 132482730852. Its totient is φ = 130158472192.

The previous prime is 131320601473. The next prime is 131320601557. The reversal of 131320601521 is 125106023131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71374465600 + 59946135921 = 267160^2 + 244839^2 .

It is a cyclic number.

It is not a de Polignac number, because 131320601521 - 2⁷ = 131320601393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131320601561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 581064496 + ... + 581064721.

It is an arithmetic number, because the mean of its divisors is an integer number (33120682713).

Almost surely, 2^131320601521 is an apocalyptic number.

It is an amenable number.

131320601521 is a deficient number, since it is larger than the sum of its proper divisors (1162129331).

131320601521 is a wasteful number, since it uses less digits than its factorization.

131320601521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162129330.

The product of its (nonzero) digits is 1080, while the sum is 25.

Adding to 131320601521 its reverse (125106023131), we get a palindrome (256426624652).

The spelling of 131320601521 in words is "one hundred thirty-one billion, three hundred twenty million, six hundred one thousand, five hundred twenty-one".