641552617 has 2 divisors, whose sum is σ = 641552618. Its totient is φ = 641552616.

The previous prime is 641552609. The next prime is 641552669. The reversal of 641552617 is 716255146.

It is a happy number.

641552617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 460488681 + 181063936 = 21459^2 + 13456^2 .

It is a cyclic number.

It is not a de Polignac number, because 641552617 - 2³ = 641552609 is a prime.

It is equal to p_33377239 and since 641552617 and 33377239 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (641552117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320776308 + 320776309.

It is an arithmetic number, because the mean of its divisors is an integer number (320776309).

Almost surely, 2^641552617 is an apocalyptic number.

It is an amenable number.

641552617 is a deficient number, since it is larger than the sum of its proper divisors (1).

641552617 is an equidigital number, since it uses as much as digits as its factorization.

641552617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 37.

The square root of 641552617 is about 25328.8889807666. Note that the first 3 decimals coincide. The cubic root of 641552617 is about 862.4701907222.

The spelling of 641552617 in words is "six hundred forty-one million, five hundred fifty-two thousand, six hundred seventeen".