131193531 has 36 divisors (see below), whose sum is σ = 221250744. Its totient is φ = 74692800.

The previous prime is 131193523. The next prime is 131193533. The reversal of 131193531 is 135391131.

131193531 is a `hidden beast` number, since 13 + 119 + 3 + 531 = 666.

It is not a de Polignac number, because 131193531 - 2³ = 131193523 is a prime.

It is a super-2 number, since 2×131193531² = 34423485152495922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 131193495 and 131193504.

It is not an unprimeable number, because it can be changed into a prime (131193533) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 229476 + ... + 230046.

It is an arithmetic number, because the mean of its divisors is an integer number (6145854).

Almost surely, 2^131193531 is an apocalyptic number.

131193531 is a deficient number, since it is larger than the sum of its proper divisors (90057213).

131193531 is a wasteful number, since it uses less digits than its factorization.

131193531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112 (or 1102 counting only the distinct ones).

The product of its digits is 1215, while the sum is 27.

The square root of 131193531 is about 11453.9744630412. The cubic root of 131193531 is about 508.1252855579.

The spelling of 131193531 in words is "one hundred thirty-one million, one hundred ninety-three thousand, five hundred thirty-one".