621945671 has 2 divisors, whose sum is σ = 621945672. Its totient is φ = 621945670.

The previous prime is 621945661. The next prime is 621945707. The reversal of 621945671 is 176549126.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 621945671 - 2²² = 617751367 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621945641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310972835 + 310972836.

It is an arithmetic number, because the mean of its divisors is an integer number (310972836).

Almost surely, 2^621945671 is an apocalyptic number.

621945671 is a deficient number, since it is larger than the sum of its proper divisors (1).

621945671 is an equidigital number, since it uses as much as digits as its factorization.

621945671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 621945671 is about 24938.8386056769. The cubic root of 621945671 is about 853.5929439629.

The spelling of 621945671 in words is "six hundred twenty-one million, nine hundred forty-five thousand, six hundred seventy-one".