626638273 has 2 divisors, whose sum is σ = 626638274. Its totient is φ = 626638272.

The previous prime is 626638249. The next prime is 626638279. The reversal of 626638273 is 372836626.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 626601024 + 37249 = 25032^2 + 193^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-626638273 is a prime.

It is not a weakly prime, because it can be changed into another prime (626638279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313319136 + 313319137.

It is an arithmetic number, because the mean of its divisors is an integer number (313319137).

Almost surely, 2^626638273 is an apocalyptic number.

It is an amenable number.

626638273 is a deficient number, since it is larger than the sum of its proper divisors (1).

626638273 is an equidigital number, since it uses as much as digits as its factorization.

626638273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 43.

The square root of 626638273 is about 25032.7440165876. The cubic root of 626638273 is about 855.7343635423.

The spelling of 626638273 in words is "six hundred twenty-six million, six hundred thirty-eight thousand, two hundred seventy-three".