13111431 has 32 divisors (see below), whose sum is σ = 19100928. Its totient is φ = 7983360.

The previous prime is 13111429. The next prime is 13111433. The reversal of 13111431 is 13411131.

It is an interprime number because it is at equal distance from previous prime (13111429) and next prime (13111433).

It is not a de Polignac number, because 13111431 - 2¹ = 13111429 is a prime.

It is a super-2 number, since 2×13111431² = 343819245735522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13111431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13111433) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 195660 + ... + 195726.

It is an arithmetic number, because the mean of its divisors is an integer number (596904).

Almost surely, 2^13111431 is an apocalyptic number.

13111431 is a deficient number, since it is larger than the sum of its proper divisors (5989497).

13111431 is a wasteful number, since it uses less digits than its factorization.

13111431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191.

The product of its digits is 36, while the sum is 15.

The square root of 13111431 is about 3620.9710023694. The cubic root of 13111431 is about 235.8033828733.

Adding to 13111431 its reverse (13411131), we get a palindrome (26522562).

The spelling of 13111431 in words is "thirteen million, one hundred eleven thousand, four hundred thirty-one".