626139089 has 2 divisors, whose sum is σ = 626139090. Its totient is φ = 626139088.

The previous prime is 626139043. The next prime is 626139103. The reversal of 626139089 is 980931626.

626139089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 323100625 + 303038464 = 17975^2 + 17408^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-626139089 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (626139289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313069544 + 313069545.

It is an arithmetic number, because the mean of its divisors is an integer number (313069545).

Almost surely, 2^626139089 is an apocalyptic number.

It is an amenable number.

626139089 is a deficient number, since it is larger than the sum of its proper divisors (1).

626139089 is an equidigital number, since it uses as much as digits as its factorization.

626139089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 626139089 is about 25022.7714092584. The cubic root of 626139089 is about 855.5070753818.

The spelling of 626139089 in words is "six hundred twenty-six million, one hundred thirty-nine thousand, eighty-nine".