309999999897 has 24 divisors (see below), whose sum is σ = 512099842176. Its totient is φ = 177020384256.

The previous prime is 309999999877. The next prime is 309999999899. The reversal of 309999999897 is 798999999903.

It is not a de Polignac number, because 309999999897 - 2⁶ = 309999999833 is a prime.

It is a super-2 number, since 2×309999999897² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (309999999899) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1609128 + ... + 1791449.

It is an arithmetic number, because the mean of its divisors is an integer number (21337493424).

Almost surely, 2^309999999897 is an apocalyptic number.

It is an amenable number.

309999999897 is a deficient number, since it is larger than the sum of its proper divisors (202099842279).

309999999897 is a wasteful number, since it uses less digits than its factorization.

309999999897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3402037 (or 3402034 counting only the distinct ones).

The product of its (nonzero) digits is 7231849128, while the sum is 90.

The spelling of 309999999897 in words is "three hundred nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, eight hundred ninety-seven".