125811139 has 2 divisors, whose sum is σ = 125811140. Its totient is φ = 125811138.

The previous prime is 125811121. The next prime is 125811143. The reversal of 125811139 is 931118521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 125811139 - 2⁷ = 125811011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125811139.

It is not a weakly prime, because it can be changed into another prime (125811239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62905569 + 62905570.

It is an arithmetic number, because the mean of its divisors is an integer number (62905570).

Almost surely, 2^125811139 is an apocalyptic number.

125811139 is a deficient number, since it is larger than the sum of its proper divisors (1).

125811139 is an equidigital number, since it uses as much as digits as its factorization.

125811139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 31.

The square root of 125811139 is about 11216.5564680075. The cubic root of 125811139 is about 501.0791876987.

The spelling of 125811139 in words is "one hundred twenty-five million, eight hundred eleven thousand, one hundred thirty-nine".