31130113123 has 4 divisors (see below), whose sum is σ = 31130565448. Its totient is φ = 31129660800.

The previous prime is 31130113099. The next prime is 31130113141. The reversal of 31130113123 is 32131103113.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31130113123 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31130113123.

It is not an unprimeable number, because it can be changed into a prime (31130113153) 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, 99153 + ... + 268498.

It is an arithmetic number, because the mean of its divisors is an integer number (7782641362).

Almost surely, 2^31130113123 is an apocalyptic number.

31130113123 is a deficient number, since it is larger than the sum of its proper divisors (452325).

31130113123 is an equidigital number, since it uses as much as digits as its factorization.

31130113123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452324.

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

Adding to 31130113123 its reverse (32131103113), we get a palindrome (63261216236).

The spelling of 31130113123 in words is "thirty-one billion, one hundred thirty million, one hundred thirteen thousand, one hundred twenty-three".