231109878015 has 12 divisors (see below), whose sum is σ = 400590455304. Its totient is φ = 123258601584.

The previous prime is 231109878007. The next prime is 231109878017. The reversal of 231109878015 is 510878901132.

It is not a de Polignac number, because 231109878015 - 2³ = 231109878007 is a prime.

It is a super-2 number, since 2×231109878015² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 5135775067 = 231109878015 / (2 + 3 + 1 + 1 + 0 + 9 + 8 + 7 + 8 + 0 + 1 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231109878017) 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, 2567887489 + ... + 2567887578.

It is an arithmetic number, because the mean of its divisors is an integer number (33382537942).

Almost surely, 2^231109878015 is an apocalyptic number.

231109878015 is a deficient number, since it is larger than the sum of its proper divisors (169480577289).

231109878015 is a wasteful number, since it uses less digits than its factorization.

231109878015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5135775078 (or 5135775075 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The spelling of 231109878015 in words is "two hundred thirty-one billion, one hundred nine million, eight hundred seventy-eight thousand, fifteen".