641307825 has 18 divisors (see below), whose sum is σ = 1148653974. Its totient is φ = 342030720.

The previous prime is 641307803. The next prime is 641307829. The reversal of 641307825 is 528703146.

641307825 is a `hidden beast` number, since 641 + 3 + 0 + 7 + 8 + 2 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 89245809 + 552062016 = 9447^2 + 23496^2 .

It is not a de Polignac number, because 641307825 - 2⁷ = 641307697 is a prime.

It is a super-2 number, since 2×641307825² = 822551452812461250, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 641307825.

It is not an unprimeable number, because it can be changed into a prime (641307829) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1424904 + ... + 1425353.

Almost surely, 2^641307825 is an apocalyptic number.

It is an amenable number.

641307825 is a deficient number, since it is larger than the sum of its proper divisors (507346149).

641307825 is a wasteful number, since it uses less digits than its factorization.

641307825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2850273 (or 2850265 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 641307825 is about 25324.0562509247. The cubic root of 641307825 is about 862.3604815284.

The spelling of 641307825 in words is "six hundred forty-one million, three hundred seven thousand, eight hundred twenty-five".