13011312231 has 16 divisors (see below), whose sum is σ = 19940709600. Its totient is φ = 8375097024.

The previous prime is 13011312229. The next prime is 13011312247. The reversal of 13011312231 is 13221311031.

13011312231 is a `hidden beast` number, since 1 + 301 + 131 + 2 + 231 = 666.

It is not a de Polignac number, because 13011312231 - 2¹ = 13011312229 is a prime.

It is a super-2 number, since 2×13011312231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13011312131) 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, 8307846 + ... + 8309411.

It is an arithmetic number, because the mean of its divisors is an integer number (1246294350).

Almost surely, 2^13011312231 is an apocalyptic number.

13011312231 is a deficient number, since it is larger than the sum of its proper divisors (6929397369).

13011312231 is a wasteful number, since it uses less digits than its factorization.

13011312231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16617295 (or 16617289 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 13011312231 its reverse (13221311031), we get a palindrome (26232623262).

The spelling of 13011312231 in words is "thirteen billion, eleven million, three hundred twelve thousand, two hundred thirty-one".