641190817 has 2 divisors, whose sum is σ = 641190818. Its totient is φ = 641190816.

The previous prime is 641190811. The next prime is 641190839. The reversal of 641190817 is 718091146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 421439841 + 219750976 = 20529^2 + 14824^2 .

It is a cyclic number.

It is not a de Polignac number, because 641190817 - 2⁷ = 641190689 is a prime.

It is a super-2 number, since 2×641190817² = 822251327610254978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (641190811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320595408 + 320595409.

It is an arithmetic number, because the mean of its divisors is an integer number (320595409).

Almost surely, 2^641190817 is an apocalyptic number.

It is an amenable number.

641190817 is a deficient number, since it is larger than the sum of its proper divisors (1).

641190817 is an equidigital number, since it uses as much as digits as its factorization.

641190817 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 37.

The square root of 641190817 is about 25321.7459311162. The cubic root of 641190817 is about 862.3080318266.

The spelling of 641190817 in words is "six hundred forty-one million, one hundred ninety thousand, eight hundred seventeen".