131135431 has 4 divisors (see below), whose sum is σ = 149869072. Its totient is φ = 112401792.

The previous prime is 131135413. The next prime is 131135447. The reversal of 131135431 is 134531131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131135431 - 2¹⁵ = 131102663 is a prime.

It is a super-2 number, since 2×131135431² = 34393002527111522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131135491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9366810 + ... + 9366823.

It is an arithmetic number, because the mean of its divisors is an integer number (37467268).

Almost surely, 2^131135431 is an apocalyptic number.

131135431 is a deficient number, since it is larger than the sum of its proper divisors (18733641).

131135431 is an equidigital number, since it uses as much as digits as its factorization.

131135431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18733640.

The product of its digits is 540, while the sum is 22.

The square root of 131135431 is about 11451.4379446426. The cubic root of 131135431 is about 508.0502655017.

Adding to 131135431 its reverse (134531131), we get a palindrome (265666562).

The spelling of 131135431 in words is "one hundred thirty-one million, one hundred thirty-five thousand, four hundred thirty-one".