621642067 has 2 divisors, whose sum is σ = 621642068. Its totient is φ = 621642066.

The previous prime is 621642037. The next prime is 621642071. The reversal of 621642067 is 760246126.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621642067 is a prime.

It is not a weakly prime, because it can be changed into another prime (621642017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310821033 + 310821034.

It is an arithmetic number, because the mean of its divisors is an integer number (310821034).

Almost surely, 2^621642067 is an apocalyptic number.

621642067 is a deficient number, since it is larger than the sum of its proper divisors (1).

621642067 is an equidigital number, since it uses as much as digits as its factorization.

621642067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 621642067 is about 24932.7508911472. The cubic root of 621642067 is about 853.4540269993.

The spelling of 621642067 in words is "six hundred twenty-one million, six hundred forty-two thousand, sixty-seven".