641833901 has 2 divisors, whose sum is σ = 641833902. Its totient is φ = 641833900.

The previous prime is 641833897. The next prime is 641833943. The reversal of 641833901 is 109338146.

641833901 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., 611572900 + 30261001 = 24730^2 + 5501^2 .

It is a cyclic number.

It is not a de Polignac number, because 641833901 - 2² = 641833897 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641833501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320916950 + 320916951.

It is an arithmetic number, because the mean of its divisors is an integer number (320916951).

Almost surely, 2^641833901 is an apocalyptic number.

It is an amenable number.

641833901 is a deficient number, since it is larger than the sum of its proper divisors (1).

641833901 is an equidigital number, since it uses as much as digits as its factorization.

641833901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 641833901 is about 25334.4410042930. The cubic root of 641833901 is about 862.5962201972.

The spelling of 641833901 in words is "six hundred forty-one million, eight hundred thirty-three thousand, nine hundred one".