641515244 has 6 divisors (see below), whose sum is σ = 1122651684. Its totient is φ = 320757620.

The previous prime is 641515207. The next prime is 641515279. The reversal of 641515244 is 442515146.

It is a self number, because there is not a number n which added to its sum of digits gives 641515244.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80189402 + ... + 80189409.

It is an arithmetic number, because the mean of its divisors is an integer number (187108614).

Almost surely, 2^641515244 is an apocalyptic number.

It is an amenable number.

641515244 is a deficient number, since it is larger than the sum of its proper divisors (481136440).

641515244 is a wasteful number, since it uses less digits than its factorization.

641515244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160378815 (or 160378813 counting only the distinct ones).

The product of its digits is 19200, while the sum is 32.

The square root of 641515244 is about 25328.1512155941. The cubic root of 641515244 is about 862.4534429536.

The spelling of 641515244 in words is "six hundred forty-one million, five hundred fifteen thousand, two hundred forty-four".