131531109 has 24 divisors (see below), whose sum is σ = 185603616. Its totient is φ = 82807200.

The previous prime is 131531093. The next prime is 131531143. The reversal of 131531109 is 901135131.

It is not a de Polignac number, because 131531109 - 2⁴ = 131531093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131531149) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 123439 + ... + 124499.

It is an arithmetic number, because the mean of its divisors is an integer number (7733484).

Almost surely, 2^131531109 is an apocalyptic number.

It is an amenable number.

131531109 is a deficient number, since it is larger than the sum of its proper divisors (54072507).

131531109 is a wasteful number, since it uses less digits than its factorization.

131531109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169 (or 1138 counting only the distinct ones).

The product of its (nonzero) digits is 405, while the sum is 24.

The square root of 131531109 is about 11468.7012778257. The cubic root of 131531109 is about 508.5607364058.

The spelling of 131531109 in words is "one hundred thirty-one million, five hundred thirty-one thousand, one hundred nine".