31310120123 has 4 divisors (see below), whose sum is σ = 31311239880. Its totient is φ = 31309000368.

The previous prime is 31310120119. The next prime is 31310120173. The reversal of 31310120123 is 32102101313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32102101313 = 197 ⋅162954829.

It is a cyclic number.

It is not a de Polignac number, because 31310120123 - 2² = 31310120119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31310120173) 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, 516833 + ... + 574226.

It is an arithmetic number, because the mean of its divisors is an integer number (7827809970).

Almost surely, 2^31310120123 is an apocalyptic number.

31310120123 is a deficient number, since it is larger than the sum of its proper divisors (1119757).

31310120123 is a wasteful number, since it uses less digits than its factorization.

31310120123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119756.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31310120123 its reverse (32102101313), we get a palindrome (63412221436).

The spelling of 31310120123 in words is "thirty-one billion, three hundred ten million, one hundred twenty thousand, one hundred twenty-three".