641916701 has 2 divisors, whose sum is σ = 641916702. Its totient is φ = 641916700.

The previous prime is 641916679. The next prime is 641916763. The reversal of 641916701 is 107619146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 627552601 + 14364100 = 25051^2 + 3790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641916701 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641916601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320958350 + 320958351.

It is an arithmetic number, because the mean of its divisors is an integer number (320958351).

Almost surely, 2^641916701 is an apocalyptic number.

It is an amenable number.

641916701 is a deficient number, since it is larger than the sum of its proper divisors (1).

641916701 is an equidigital number, since it uses as much as digits as its factorization.

641916701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 641916701 is about 25336.0750906686. The cubic root of 641916701 is about 862.6333117748.

The spelling of 641916701 in words is "six hundred forty-one million, nine hundred sixteen thousand, seven hundred one".