31312323123121 has 4 divisors (see below), whose sum is σ = 31337193913200. Its totient is φ = 31287452333044.

The previous prime is 31312323123079. The next prime is 31312323123227. The reversal of 31312323123121 is 12132132321313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31312323123121 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 31312323123121.

It is not an unprimeable number, because it can be changed into a prime (31312323127121) 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, 12435393151 + ... + 12435395668.

It is an arithmetic number, because the mean of its divisors is an integer number (7834298478300).

Almost surely, 2^{31312323123121} is an apocalyptic number.

It is an amenable number.

31312323123121 is a deficient number, since it is larger than the sum of its proper divisors (24870790079).

31312323123121 is a wasteful number, since it uses less digits than its factorization.

31312323123121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24870790078.

The product of its digits is 3888, while the sum is 28.

Adding to 31312323123121 its reverse (12132132321313), we get a palindrome (43444455444434).

The spelling of 31312323123121 in words is "thirty-one trillion, three hundred twelve billion, three hundred twenty-three million, one hundred twenty-three thousand, one hundred twenty-one".