621326369 has 2 divisors, whose sum is σ = 621326370. Its totient is φ = 621326368.

The previous prime is 621326351. The next prime is 621326371. The reversal of 621326369 is 963623126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 349241344 + 272085025 = 18688^2 + 16495^2 .

It is a cyclic number.

It is not a de Polignac number, because 621326369 - 2⁸ = 621326113 is a prime.

It is a super-2 number, since 2×621326369² = 772092913629448322, which contains 22 as substring.

Together with 621326371, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (621326569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310663184 + 310663185.

It is an arithmetic number, because the mean of its divisors is an integer number (310663185).

Almost surely, 2^621326369 is an apocalyptic number.

It is an amenable number.

621326369 is a deficient number, since it is larger than the sum of its proper divisors (1).

621326369 is an equidigital number, since it uses as much as digits as its factorization.

621326369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 38.

The square root of 621326369 is about 24926.4190970143. The cubic root of 621326369 is about 853.3095283310.

The spelling of 621326369 in words is "six hundred twenty-one million, three hundred twenty-six thousand, three hundred sixty-nine".