131521575 has 24 divisors (see below), whose sum is σ = 218505856. Its totient is φ = 69804000.

The previous prime is 131521573. The next prime is 131521597. The reversal of 131521575 is 575125131.

It is not a de Polignac number, because 131521575 - 2¹ = 131521573 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131521573) 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 23 ways as a sum of consecutive naturals, for example, 11670 + ... + 19980.

Almost surely, 2^131521575 is an apocalyptic number.

131521575 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

131521575 is a deficient number, since it is larger than the sum of its proper divisors (86984281).

131521575 is a wasteful number, since it uses less digits than its factorization.

131521575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8535 (or 8530 counting only the distinct ones).

The product of its digits is 5250, while the sum is 30.

The square root of 131521575 is about 11468.2856173013. The cubic root of 131521575 is about 508.5484484757.

The spelling of 131521575 in words is "one hundred thirty-one million, five hundred twenty-one thousand, five hundred seventy-five".