815225499 has 16 divisors (see below), whose sum is σ = 1317536640. Its totient is φ = 494075880.

The previous prime is 815225473. The next prime is 815225513. The reversal of 815225499 is 994522518.

It is a happy number.

815225499 is a `hidden beast` number, since 8 + 152 + 2 + 5 + 499 = 666.

It is not a de Polignac number, because 815225499 - 2⁷ = 815225371 is a prime.

It is a super-2 number, since 2×815225499² = 1329185228439598002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (815225449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1372137 + ... + 1372730.

It is an arithmetic number, because the mean of its divisors is an integer number (82346040).

Almost surely, 2^815225499 is an apocalyptic number.

815225499 is a deficient number, since it is larger than the sum of its proper divisors (502311141).

815225499 is a wasteful number, since it uses less digits than its factorization.

815225499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2744887 (or 2744881 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 815225499 is about 28552.1540168163. The cubic root of 815225499 is about 934.1700047583.

The spelling of 815225499 in words is "eight hundred fifteen million, two hundred twenty-five thousand, four hundred ninety-nine".