131616431 has 4 divisors (see below), whose sum is σ = 139358592. Its totient is φ = 123874272.

The previous prime is 131616427. The next prime is 131616481. The reversal of 131616431 is 134616131.

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 131616431 - 2² = 131616427 is a prime.

It is a super-2 number, since 2×131616431² = 34645769818355522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131616431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131616481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3871055 + ... + 3871088.

It is an arithmetic number, because the mean of its divisors is an integer number (34839648).

Almost surely, 2^131616431 is an apocalyptic number.

131616431 is a deficient number, since it is larger than the sum of its proper divisors (7742161).

131616431 is an equidigital number, since it uses as much as digits as its factorization.

131616431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7742160.

The product of its digits is 1296, while the sum is 26.

The square root of 131616431 is about 11472.4204508029. The cubic root of 131616431 is about 508.6706775456.

The spelling of 131616431 in words is "one hundred thirty-one million, six hundred sixteen thousand, four hundred thirty-one".