131518917 has 32 divisors (see below), whose sum is σ = 201398400. Its totient is φ = 84779136.

The previous prime is 131518889. The next prime is 131518921. The reversal of 131518917 is 719815131.

131518917 is a `hidden beast` number, since 131 + 518 + 9 + 1 + 7 = 666.

It is not a de Polignac number, because 131518917 - 2⁸ = 131518661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131518967) 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, 103834 + ... + 105092.

It is an arithmetic number, because the mean of its divisors is an integer number (6293700).

Almost surely, 2^131518917 is an apocalyptic number.

It is an amenable number.

131518917 is a deficient number, since it is larger than the sum of its proper divisors (69879483).

131518917 is a wasteful number, since it uses less digits than its factorization.

131518917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1394 (or 1388 counting only the distinct ones).

The product of its digits is 7560, while the sum is 36.

The square root of 131518917 is about 11468.1697319145. The cubic root of 131518917 is about 508.5450225971.

The spelling of 131518917 in words is "one hundred thirty-one million, five hundred eighteen thousand, nine hundred seventeen".