309809139254 has 16 divisors (see below), whose sum is σ = 467913709536. Its totient is φ = 153838440000.

The previous prime is 309809139239. The next prime is 309809139259. The reversal of 309809139254 is 452931908903.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 309809139196 and 309809139205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309809139259) 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 7 ways as a sum of consecutive naturals, for example, 1038554 + ... + 1303154.

It is an arithmetic number, because the mean of its divisors is an integer number (29244606846).

Almost surely, 2^309809139254 is an apocalyptic number.

309809139254 is a deficient number, since it is larger than the sum of its proper divisors (158104570282).

309809139254 is a wasteful number, since it uses less digits than its factorization.

309809139254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268631.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The spelling of 309809139254 in words is "three hundred nine billion, eight hundred nine million, one hundred thirty-nine thousand, two hundred fifty-four".