641791508 has 12 divisors (see below), whose sum is σ = 1130289972. Its totient is φ = 318851520.

The previous prime is 641791487. The next prime is 641791541. The reversal of 641791508 is 805197146.

It can be written as a sum of positive squares in 2 ways, for example, as 231404944 + 410386564 = 15212^2 + 20258^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 510353 + ... + 511608.

It is an arithmetic number, because the mean of its divisors is an integer number (94190831).

Almost surely, 2^641791508 is an apocalyptic number.

It is an amenable number.

641791508 is a deficient number, since it is larger than the sum of its proper divisors (488498464).

641791508 is a wasteful number, since it uses less digits than its factorization.

641791508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022122 (or 1022120 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 641791508 is about 25333.6043231120. The cubic root of 641791508 is about 862.5772283435.

The spelling of 641791508 in words is "six hundred forty-one million, seven hundred ninety-one thousand, five hundred eight".