131391439 has 2 divisors, whose sum is σ = 131391440. Its totient is φ = 131391438.

The previous prime is 131391427. The next prime is 131391451. The reversal of 131391439 is 934193131.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (131391427) and next prime (131391451).

It is a cyclic number.

It is not a de Polignac number, because 131391439 - 2⁷ = 131391311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131397439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65695719 + 65695720.

It is an arithmetic number, because the mean of its divisors is an integer number (65695720).

Almost surely, 2^131391439 is an apocalyptic number.

131391439 is a deficient number, since it is larger than the sum of its proper divisors (1).

131391439 is an equidigital number, since it uses as much as digits as its factorization.

131391439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 34.

The square root of 131391439 is about 11462.6104792931. The cubic root of 131391439 is about 508.3806628212.

The spelling of 131391439 in words is "one hundred thirty-one million, three hundred ninety-one thousand, four hundred thirty-nine".