999808097 has 12 divisors (see below), whose sum is σ = 1064466468. Its totient is φ = 935827200.

The previous prime is 999808057. The next prime is 999808169. The reversal of 999808097 is 790808999.

It can be written as a sum of positive squares in 2 ways, for example, as 860190241 + 139617856 = 29329^2 + 11816^2 .

It is not a de Polignac number, because 999808097 - 2²² = 995613793 is a prime.

It is a super-2 number, since 2×999808097² = 1999232461653522818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999808057) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 756197 + ... + 757517.

It is an arithmetic number, because the mean of its divisors is an integer number (88705539).

Almost surely, 2^999808097 is an apocalyptic number.

It is an amenable number.

999808097 is a deficient number, since it is larger than the sum of its proper divisors (64658371).

999808097 is a wasteful number, since it uses less digits than its factorization.

999808097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1760 (or 1549 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 59.

The square root of 999808097 is about 31619.7422032502. The cubic root of 999808097 is about 999.9360282410.

The spelling of 999808097 in words is "nine hundred ninety-nine million, eight hundred eight thousand, ninety-seven".