31130113231 has 16 divisors (see below), whose sum is σ = 37417863168. Its totient is φ = 25334992800.

The previous prime is 31130113187. The next prime is 31130113237. The reversal of 31130113231 is 13231103113.

It is a cyclic number.

It is not a de Polignac number, because 31130113231 - 2¹¹ = 31130111183 is a prime.

It is a super-2 number, since 2×31130113231² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31130113199 and 31130113208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31130113237) 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, 1341865 + ... + 1364866.

It is an arithmetic number, because the mean of its divisors is an integer number (2338616448).

Almost surely, 2^31130113231 is an apocalyptic number.

31130113231 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

31130113231 is a deficient number, since it is larger than the sum of its proper divisors (6287749937).

31130113231 is a wasteful number, since it uses less digits than its factorization.

31130113231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2706822.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 31130113231 its reverse (13231103113), we get a palindrome (44361216344).

The spelling of 31130113231 in words is "thirty-one billion, one hundred thirty million, one hundred thirteen thousand, two hundred thirty-one".