131521569 has 16 divisors (see below), whose sum is σ = 181272768. Its totient is φ = 84756672.

The previous prime is 131521543. The next prime is 131521573. The reversal of 131521569 is 965125131.

It is not a de Polignac number, because 131521569 - 2⁹ = 131521057 is a prime.

It is a super-2 number, since 2×131521569² = 34595846224443522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (131521069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13654 + ... + 21200.

It is an arithmetic number, because the mean of its divisors is an integer number (11329548).

Almost surely, 2^131521569 is an apocalyptic number.

It is an amenable number.

131521569 is a deficient number, since it is larger than the sum of its proper divisors (49751199).

131521569 is a wasteful number, since it uses less digits than its factorization.

131521569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7744.

The product of its digits is 8100, while the sum is 33.

The square root of 131521569 is about 11468.2853557103. The cubic root of 131521569 is about 508.5484407424.

The spelling of 131521569 in words is "one hundred thirty-one million, five hundred twenty-one thousand, five hundred sixty-nine".