641641417 has 2 divisors, whose sum is σ = 641641418. Its totient is φ = 641641416.

The previous prime is 641641391. The next prime is 641641439. The reversal of 641641417 is 714146146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 342213001 + 299428416 = 18499^2 + 17304^2 .

It is a cyclic number.

It is not a de Polignac number, because 641641417 - 2⁷ = 641641289 is a prime.

It is not a weakly prime, because it can be changed into another prime (641641477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320820708 + 320820709.

It is an arithmetic number, because the mean of its divisors is an integer number (320820709).

Almost surely, 2^641641417 is an apocalyptic number.

It is an amenable number.

641641417 is a deficient number, since it is larger than the sum of its proper divisors (1).

641641417 is an equidigital number, since it uses as much as digits as its factorization.

641641417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 34.

The square root of 641641417 is about 25330.6418592186. The cubic root of 641641417 is about 862.5099815970.

The spelling of 641641417 in words is "six hundred forty-one million, six hundred forty-one thousand, four hundred seventeen".