131431439 has 2 divisors, whose sum is σ = 131431440. Its totient is φ = 131431438.

The previous prime is 131431423. The next prime is 131431441. The reversal of 131431439 is 934134131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131431439 - 2⁴ = 131431423 is a prime.

It is a super-2 number, since 2×131431439² = 34548446315221442, which contains 22 as substring.

Together with 131431441, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131431459) 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 as a sum of consecutive naturals, namely, 65715719 + 65715720.

It is an arithmetic number, because the mean of its divisors is an integer number (65715720).

Almost surely, 2^131431439 is an apocalyptic number.

131431439 is a deficient number, since it is larger than the sum of its proper divisors (1).

131431439 is an equidigital number, since it uses as much as digits as its factorization.

131431439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 29.

The square root of 131431439 is about 11464.3551497675. The cubic root of 131431439 is about 508.4322470123.

The spelling of 131431439 in words is "one hundred thirty-one million, four hundred thirty-one thousand, four hundred thirty-nine".