626921 has 2 divisors, whose sum is σ = 626922. Its totient is φ = 626920.

The previous prime is 626917. The next prime is 626929. The reversal of 626921 is 129626.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 336400 + 290521 = 580^2 + 539^2 .

It is a cyclic number.

It is not a de Polignac number, because 626921 - 2² = 626917 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (626929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313460 + 313461.

It is an arithmetic number, because the mean of its divisors is an integer number (313461).

2⁶²⁶⁹²¹ is an apocalyptic number.

It is an amenable number.

626921 is a deficient number, since it is larger than the sum of its proper divisors (1).

626921 is an equidigital number, since it uses as much as digits as its factorization.

626921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 26.

The square root of 626921 is about 791.7834299858. The cubic root of 626921 is about 85.5863041092.

The spelling of 626921 in words is "six hundred twenty-six thousand, nine hundred twenty-one".