626139289 has 2 divisors, whose sum is σ = 626139290. Its totient is φ = 626139288.

The previous prime is 626139247. The next prime is 626139341. The reversal of 626139289 is 982931626.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 316555264 + 309584025 = 17792^2 + 17595^2 .

It is a cyclic number.

It is not a de Polignac number, because 626139289 - 2⁷ = 626139161 is a prime.

It is not a weakly prime, because it can be changed into another prime (626139089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313069644 + 313069645.

It is an arithmetic number, because the mean of its divisors is an integer number (313069645).

Almost surely, 2^626139289 is an apocalyptic number.

It is an amenable number.

626139289 is a deficient number, since it is larger than the sum of its proper divisors (1).

626139289 is an equidigital number, since it uses as much as digits as its factorization.

626139289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 46.

The square root of 626139289 is about 25022.7754056180. The cubic root of 626139289 is about 855.5071664698.

The spelling of 626139289 in words is "six hundred twenty-six million, one hundred thirty-nine thousand, two hundred eighty-nine".