621644227 has 2 divisors, whose sum is σ = 621644228. Its totient is φ = 621644226.

The previous prime is 621644201. The next prime is 621644239. The reversal of 621644227 is 722446126.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 621644227 - 2²³ = 613255619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 621644192 and 621644201.

It is not a weakly prime, because it can be changed into another prime (621644327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310822113 + 310822114.

It is an arithmetic number, because the mean of its divisors is an integer number (310822114).

Almost surely, 2^621644227 is an apocalyptic number.

621644227 is a deficient number, since it is larger than the sum of its proper divisors (1).

621644227 is an equidigital number, since it uses as much as digits as its factorization.

621644227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 34.

The square root of 621644227 is about 24932.7942076294. The cubic root of 621644227 is about 853.4550154881.

The spelling of 621644227 in words is "six hundred twenty-one million, six hundred forty-four thousand, two hundred twenty-seven".