131581161 has 24 divisors (see below), whose sum is σ = 196429376. Its totient is φ = 84823200.

The previous prime is 131581157. The next prime is 131581171. The reversal of 131581161 is 161185131.

It is a happy number.

It is not a de Polignac number, because 131581161 - 2² = 131581157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131581111) 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, 38211 + ... + 41511.

Almost surely, 2^131581161 is an apocalyptic number.

It is an amenable number.

131581161 is a deficient number, since it is larger than the sum of its proper divisors (64848215).

131581161 is a wasteful number, since it uses less digits than its factorization.

131581161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3453 (or 3450 counting only the distinct ones).

The product of its digits is 720, while the sum is 27.

The square root of 131581161 is about 11470.8831830858. The cubic root of 131581161 is about 508.6252363661.

The spelling of 131581161 in words is "one hundred thirty-one million, five hundred eighty-one thousand, one hundred sixty-one".