626437649 has 2 divisors, whose sum is σ = 626437650. Its totient is φ = 626437648.

The previous prime is 626437589. The next prime is 626437703. The reversal of 626437649 is 946734626.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 565488400 + 60949249 = 23780^2 + 7807^2 .

It is a cyclic number.

It is not a de Polignac number, because 626437649 - 2¹⁶ = 626372113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (626437849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313218824 + 313218825.

It is an arithmetic number, because the mean of its divisors is an integer number (313218825).

Almost surely, 2^626437649 is an apocalyptic number.

It is an amenable number.

626437649 is a deficient number, since it is larger than the sum of its proper divisors (1).

626437649 is an equidigital number, since it uses as much as digits as its factorization.

626437649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 47.

The square root of 626437649 is about 25028.7364643124. The cubic root of 626437649 is about 855.6430300552.

The spelling of 626437649 in words is "six hundred twenty-six million, four hundred thirty-seven thousand, six hundred forty-nine".