131023581 has 16 divisors (see below), whose sum is σ = 188348160. Its totient is φ = 80539200.

The previous prime is 131023553. The next prime is 131023603. The reversal of 131023581 is 185320131.

It is not a de Polignac number, because 131023581 - 2²¹ = 128926429 is a prime.

It is a super-2 number, since 2×131023581² = 34334357556127122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131023511) 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 15 ways as a sum of consecutive naturals, for example, 54556 + ... + 56906.

It is an arithmetic number, because the mean of its divisors is an integer number (11771760).

Almost surely, 2^131023581 is an apocalyptic number.

It is an amenable number.

131023581 is a deficient number, since it is larger than the sum of its proper divisors (57324579).

131023581 is a wasteful number, since it uses less digits than its factorization.

131023581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3796.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 131023581 is about 11446.5532366735. The cubic root of 131023581 is about 507.9057797957.

The spelling of 131023581 in words is "one hundred thirty-one million, twenty-three thousand, five hundred eighty-one".