3131312123 has 4 divisors (see below), whose sum is σ = 3132160080. Its totient is φ = 3130464168.

The previous prime is 3131312117. The next prime is 3131312131. The reversal of 3131312123 is 3212131313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3212131313 = 701 ⋅4582213.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3131312123 is a prime.

It is a super-2 number, since 2×3131312123² = 19610231223293534258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3131312095 and 3131312104.

It is not an unprimeable number, because it can be changed into a prime (3131312143) 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, 418415 + ... + 425832.

It is an arithmetic number, because the mean of its divisors is an integer number (783040020).

Almost surely, 2^3131312123 is an apocalyptic number.

3131312123 is a deficient number, since it is larger than the sum of its proper divisors (847957).

3131312123 is an equidigital number, since it uses as much as digits as its factorization.

3131312123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847956.

The product of its digits is 324, while the sum is 20.

The square root of 3131312123 is about 55958.1283014362. The cubic root of 3131312123 is about 1462.9925675989.

Adding to 3131312123 its reverse (3212131313), we get a palindrome (6343443436).

The spelling of 3131312123 in words is "three billion, one hundred thirty-one million, three hundred twelve thousand, one hundred twenty-three".