131625581 has 4 divisors (see below), whose sum is σ = 131998812. Its totient is φ = 131252352.

The previous prime is 131625547. The next prime is 131625583. The reversal of 131625581 is 185526131.

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 68740681 + 62884900 = 8291^2 + 7930^2 .

It is a cyclic number.

It is not a de Polignac number, because 131625581 - 2²² = 127431277 is a prime.

It is a super-2 number, since 2×131625581² = 34650587147175122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131625583) 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, 186086 + ... + 186791.

It is an arithmetic number, because the mean of its divisors is an integer number (32999703).

Almost surely, 2^131625581 is an apocalyptic number.

It is an amenable number.

131625581 is a deficient number, since it is larger than the sum of its proper divisors (373231).

131625581 is an equidigital number, since it uses as much as digits as its factorization.

131625581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373230.

The product of its digits is 7200, while the sum is 32.

The square root of 131625581 is about 11472.8192263279. The cubic root of 131625581 is about 508.6824649007.

The spelling of 131625581 in words is "one hundred thirty-one million, six hundred twenty-five thousand, five hundred eighty-one".