815955459 has 16 divisors (see below), whose sum is σ = 1206303744. Its totient is φ = 486410400.

The previous prime is 815955451. The next prime is 815955499. The reversal of 815955459 is 954559518.

It is not a de Polignac number, because 815955459 - 2³ = 815955451 is a prime.

It is a super-2 number, since 2×815955459² = 1331566622143801362, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (815955451) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 200659 + ... + 204684.

It is an arithmetic number, because the mean of its divisors is an integer number (75393984).

Almost surely, 2^815955459 is an apocalyptic number.

815955459 is a deficient number, since it is larger than the sum of its proper divisors (390348285).

815955459 is a wasteful number, since it uses less digits than its factorization.

815955459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405418.

The product of its digits is 1620000, while the sum is 51.

The square root of 815955459 is about 28564.9340800920. The cubic root of 815955459 is about 934.4487428949.

The spelling of 815955459 in words is "eight hundred fifteen million, nine hundred fifty-five thousand, four hundred fifty-nine".