131121439 has 2 divisors, whose sum is σ = 131121440. Its totient is φ = 131121438.

The previous prime is 131121433. The next prime is 131121457. The reversal of 131121439 is 934121131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131121439 - 2²⁵ = 97567007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131121433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65560719 + 65560720.

It is an arithmetic number, because the mean of its divisors is an integer number (65560720).

Almost surely, 2^131121439 is an apocalyptic number.

131121439 is a deficient number, since it is larger than the sum of its proper divisors (1).

131121439 is an equidigital number, since it uses as much as digits as its factorization.

131121439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 25.

The square root of 131121439 is about 11450.8270007017. The cubic root of 131121439 is about 508.0321953989.

The spelling of 131121439 in words is "one hundred thirty-one million, one hundred twenty-one thousand, four hundred thirty-nine".