641158994 has 16 divisors (see below), whose sum is σ = 1146918528. Its totient is φ = 262835232.

The previous prime is 641158951. The next prime is 641158997. The reversal of 641158994 is 499851146.

It is a super-2 number, since 2×641158994² = 822169711174184072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641158997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 995267 + ... + 995910.

It is an arithmetic number, because the mean of its divisors is an integer number (71682408).

Almost surely, 2^641158994 is an apocalyptic number.

641158994 is a deficient number, since it is larger than the sum of its proper divisors (505759534).

641158994 is a wasteful number, since it uses less digits than its factorization.

641158994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991209.

The product of its digits is 311040, while the sum is 47.

The square root of 641158994 is about 25321.1175503768. The cubic root of 641158994 is about 862.2937658277.

The spelling of 641158994 in words is "six hundred forty-one million, one hundred fifty-eight thousand, nine hundred ninety-four".