125431139 has 2 divisors, whose sum is σ = 125431140. Its totient is φ = 125431138.

The previous prime is 125431127. The next prime is 125431153. The reversal of 125431139 is 931134521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 125431139 - 2⁸ = 125430883 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (125431039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62715569 + 62715570.

It is an arithmetic number, because the mean of its divisors is an integer number (62715570).

Almost surely, 2^125431139 is an apocalyptic number.

125431139 is a deficient number, since it is larger than the sum of its proper divisors (1).

125431139 is an equidigital number, since it uses as much as digits as its factorization.

125431139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 29.

The square root of 125431139 is about 11199.6044126567. The cubic root of 125431139 is about 500.5741923539.

The spelling of 125431139 in words is "one hundred twenty-five million, four hundred thirty-one thousand, one hundred thirty-nine".