621642037 has 2 divisors, whose sum is σ = 621642038. Its totient is φ = 621642036.

The previous prime is 621642031. The next prime is 621642067. The reversal of 621642037 is 730246126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 566154436 + 55487601 = 23794^2 + 7449^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621642037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621642031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310821018 + 310821019.

It is an arithmetic number, because the mean of its divisors is an integer number (310821019).

Almost surely, 2^621642037 is an apocalyptic number.

It is an amenable number.

621642037 is a deficient number, since it is larger than the sum of its proper divisors (1).

621642037 is an equidigital number, since it uses as much as digits as its factorization.

621642037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 621642037 is about 24932.7502895288. The cubic root of 621642037 is about 853.4540132703.

The spelling of 621642037 in words is "six hundred twenty-one million, six hundred forty-two thousand, thirty-seven".