309981717087 has 16 divisors (see below), whose sum is σ = 472384138752. Its totient is φ = 177120767520.

The previous prime is 309981717061. The next prime is 309981717091. The reversal of 309981717087 is 780717189903.

It is not a de Polignac number, because 309981717087 - 2¹¹ = 309981715039 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 309981717087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309981716087) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152683 + ... + 802044.

It is an arithmetic number, because the mean of its divisors is an integer number (29524008672).

Almost surely, 2^309981717087 is an apocalyptic number.

309981717087 is a deficient number, since it is larger than the sum of its proper divisors (162402421665).

309981717087 is a wasteful number, since it uses less digits than its factorization.

309981717087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970198.

The product of its (nonzero) digits is 5334336, while the sum is 60.

The spelling of 309981717087 in words is "three hundred nine billion, nine hundred eighty-one million, seven hundred seventeen thousand, eighty-seven".