31123230123 has 4 divisors (see below), whose sum is σ = 41497640168. Its totient is φ = 20748820080.

The previous prime is 31123230113. The next prime is 31123230133. The reversal of 31123230123 is 32103232113.

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

It is an interprime number because it is at equal distance from previous prime (31123230113) and next prime (31123230133).

It is not a de Polignac number, because 31123230123 - 2²¹ = 31121132971 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 31123230123.

It is not an unprimeable number, because it can be changed into a prime (31123230113) 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, 5187205018 + ... + 5187205023.

It is an arithmetic number, because the mean of its divisors is an integer number (10374410042).

Almost surely, 2^31123230123 is an apocalyptic number.

31123230123 is a deficient number, since it is larger than the sum of its proper divisors (10374410045).

31123230123 is a wasteful number, since it uses less digits than its factorization.

31123230123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10374410044.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31123230123 its reverse (32103232113), we get a palindrome (63226462236).

The spelling of 31123230123 in words is "thirty-one billion, one hundred twenty-three million, two hundred thirty thousand, one hundred twenty-three".