131540402 has 24 divisors (see below), whose sum is σ = 235734444. Its totient is φ = 54849312.

The previous prime is 131540369. The next prime is 131540417. The reversal of 131540402 is 204045131.

It can be written as a sum of positive squares in 2 ways, for example, as 111281401 + 20259001 = 10549^2 + 4501^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14513 + ... + 21764.

Almost surely, 2^131540402 is an apocalyptic number.

131540402 is a deficient number, since it is larger than the sum of its proper divisors (104194042).

131540402 is a wasteful number, since it uses less digits than its factorization.

131540402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36330 (or 36323 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 131540402 is about 11469.1064168051. The cubic root of 131540402 is about 508.5727131508.

Adding to 131540402 its reverse (204045131), we get a palindrome (335585533).

The spelling of 131540402 in words is "one hundred thirty-one million, five hundred forty thousand, four hundred two".