641975959 has 2 divisors, whose sum is σ = 641975960. Its totient is φ = 641975958.

The previous prime is 641975941. The next prime is 641975969. The reversal of 641975959 is 959579146.

641975959 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 641975959 - 2⁵ = 641975927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641975969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320987979 + 320987980.

It is an arithmetic number, because the mean of its divisors is an integer number (320987980).

Almost surely, 2^641975959 is an apocalyptic number.

641975959 is a deficient number, since it is larger than the sum of its proper divisors (1).

641975959 is an equidigital number, since it uses as much as digits as its factorization.

641975959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3061800, while the sum is 55.

The square root of 641975959 is about 25337.2445029052. The cubic root of 641975959 is about 862.6598553808.

The spelling of 641975959 in words is "six hundred forty-one million, nine hundred seventy-five thousand, nine hundred fifty-nine".