641520315 has 12 divisors (see below), whose sum is σ = 1111968624. Its totient is φ = 342144144.

The previous prime is 641520289. The next prime is 641520337. The reversal of 641520315 is 513025146.

641520315 is a `hidden beast` number, since 641 + 5 + 2 + 0 + 3 + 15 = 666.

It is not a de Polignac number, because 641520315 - 2⁶ = 641520251 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7127959 + ... + 7128048.

It is an arithmetic number, because the mean of its divisors is an integer number (92664052).

Almost surely, 2^641520315 is an apocalyptic number.

641520315 is a deficient number, since it is larger than the sum of its proper divisors (470448309).

641520315 is a wasteful number, since it uses less digits than its factorization.

641520315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14256018 (or 14256015 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 641520315 is about 25328.2513214000. The cubic root of 641520315 is about 862.4557154326.

The spelling of 641520315 in words is "six hundred forty-one million, five hundred twenty thousand, three hundred fifteen".