309139534681 has 8 divisors (see below), whose sum is σ = 312932640384. Its totient is φ = 305348060880.

The previous prime is 309139534657. The next prime is 309139534709. The reversal of 309139534681 is 186435931903.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 309139534681 - 2¹¹ = 309139532633 is a prime.

It is a super-2 number, since 2×309139534681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (309139534601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24586 + ... + 786691.

It is an arithmetic number, because the mean of its divisors is an integer number (39116580048).

Almost surely, 2^309139534681 is an apocalyptic number.

It is an amenable number.

309139534681 is a deficient number, since it is larger than the sum of its proper divisors (3793105703).

309139534681 is an equidigital number, since it uses as much as digits as its factorization.

309139534681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815951.

The product of its (nonzero) digits is 2099520, while the sum is 52.

The spelling of 309139534681 in words is "three hundred nine billion, one hundred thirty-nine million, five hundred thirty-four thousand, six hundred eighty-one".