641901138 has 32 divisors (see below), whose sum is σ = 1347917760. Its totient is φ = 203501760.

The previous prime is 641901121. The next prime is 641901163. The reversal of 641901138 is 831109146.

It is a junction number, because it is equal to n+sod(n) for n = 641901099 and 641901108.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15873 + ... + 39188.

It is an arithmetic number, because the mean of its divisors is an integer number (42122430).

Almost surely, 2^641901138 is an apocalyptic number.

641901138 is an abundant number, since it is smaller than the sum of its proper divisors (706016622).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

641901138 is a wasteful number, since it uses less digits than its factorization.

641901138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55162.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 641901138 is about 25335.7679575733. The cubic root of 641901138 is about 862.6263403247.

The spelling of 641901138 in words is "six hundred forty-one million, nine hundred one thousand, one hundred thirty-eight".