31112112331 has 4 divisors (see below), whose sum is σ = 31137264832. Its totient is φ = 31086959832.

The previous prime is 31112112319. The next prime is 31112112359. The reversal of 31112112331 is 13321121113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31112112331 - 2¹¹ = 31112110283 is a prime.

It is a super-2 number, since 2×31112112331² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31112112299 and 31112112308.

It is not an unprimeable number, because it can be changed into a prime (31112112391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12574395 + ... + 12576868.

It is an arithmetic number, because the mean of its divisors is an integer number (7784316208).

Almost surely, 2^31112112331 is an apocalyptic number.

31112112331 is a deficient number, since it is larger than the sum of its proper divisors (25152501).

31112112331 is a wasteful number, since it uses less digits than its factorization.

31112112331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25152500.

The product of its digits is 108, while the sum is 19.

Adding to 31112112331 its reverse (13321121113), we get a palindrome (44433233444).

The spelling of 31112112331 in words is "thirty-one billion, one hundred twelve million, one hundred twelve thousand, three hundred thirty-one".