818491025 has 48 divisors (see below), whose sum is σ = 1192899840. Its totient is φ = 550670400.

The previous prime is 818491007. The next prime is 818491033. The reversal of 818491025 is 520194818.

It is a de Polignac number, because none of the positive numbers 2^k-818491025 is a prime.

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 818491025.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 222854 + ... + 226496.

It is an arithmetic number, because the mean of its divisors is an integer number (24852080).

Almost surely, 2^818491025 is an apocalyptic number.

It is an amenable number.

818491025 is a deficient number, since it is larger than the sum of its proper divisors (374408815).

818491025 is a wasteful number, since it uses less digits than its factorization.

818491025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3726 (or 3721 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 38.

The square root of 818491025 is about 28609.2821475828. The cubic root of 818491025 is about 935.4156692224.

The spelling of 818491025 in words is "eight hundred eighteen million, four hundred ninety-one thousand, twenty-five".