641515225 has 12 divisors (see below), whose sum is σ = 856669996. Its totient is φ = 473734080.

The previous prime is 641515207. The next prime is 641515279. The reversal of 641515225 is 522515146.

It can be written as a sum of positive squares in 6 ways, for example, as 130393561 + 511121664 = 11419^2 + 22608^2 .

It is not a de Polignac number, because 641515225 - 2¹¹ = 641513177 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 986622 + ... + 987271.

Almost surely, 2^641515225 is an apocalyptic number.

641515225 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

641515225 is a deficient number, since it is larger than the sum of its proper divisors (215154771).

641515225 is a wasteful number, since it uses less digits than its factorization.

641515225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1973916 (or 1973911 counting only the distinct ones).

The product of its digits is 12000, while the sum is 31.

The square root of 641515225 is about 25328.1508405174. The cubic root of 641515225 is about 862.4534344390.

The spelling of 641515225 in words is "six hundred forty-one million, five hundred fifteen thousand, two hundred twenty-five".