131043811581 has 32 divisors (see below), whose sum is σ = 196528573440. Its totient is φ = 86291352000.

The previous prime is 131043811559. The next prime is 131043811583. The reversal of 131043811581 is 185118340131.

It is a happy number.

131043811581 is a `hidden beast` number, since 1 + 31 + 0 + 4 + 38 + 11 + 581 = 666.

It is not a de Polignac number, because 131043811581 - 2¹⁵ = 131043778813 is a prime.

It is a super-2 number, since 2×131043811581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131043811583) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1090996 + ... + 1205138.

It is an arithmetic number, because the mean of its divisors is an integer number (6141517920).

Almost surely, 2^131043811581 is an apocalyptic number.

It is an amenable number.

131043811581 is a deficient number, since it is larger than the sum of its proper divisors (65484761859).

131043811581 is a wasteful number, since it uses less digits than its factorization.

131043811581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114674 (or 114668 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The spelling of 131043811581 in words is "one hundred thirty-one billion, forty-three million, eight hundred eleven thousand, five hundred eighty-one".