626157139 has 2 divisors, whose sum is σ = 626157140. Its totient is φ = 626157138.

The previous prime is 626157109. The next prime is 626157157. The reversal of 626157139 is 931751626.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 626157139 - 2⁹ = 626156627 is a prime.

It is not a weakly prime, because it can be changed into another prime (626157109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313078569 + 313078570.

It is an arithmetic number, because the mean of its divisors is an integer number (313078570).

Almost surely, 2^626157139 is an apocalyptic number.

626157139 is a deficient number, since it is larger than the sum of its proper divisors (1).

626157139 is an equidigital number, since it uses as much as digits as its factorization.

626157139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 40.

The square root of 626157139 is about 25023.1320781392. The cubic root of 626157139 is about 855.5152960016.

The spelling of 626157139 in words is "six hundred twenty-six million, one hundred fifty-seven thousand, one hundred thirty-nine".