31113400123 has 4 divisors (see below), whose sum is σ = 33506738608. Its totient is φ = 28720061640.

The previous prime is 31113400117. The next prime is 31113400127. The reversal of 31113400123 is 32100431113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32100431113 = 103 ⋅311654671.

It is a cyclic number.

It is not a de Polignac number, because 31113400123 - 2¹³ = 31113391931 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 31113400123.

It is not an unprimeable number, because it can be changed into a prime (31113400127) 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, 1196669223 + ... + 1196669248.

It is an arithmetic number, because the mean of its divisors is an integer number (8376684652).

Almost surely, 2^31113400123 is an apocalyptic number.

31113400123 is a deficient number, since it is larger than the sum of its proper divisors (2393338485).

31113400123 is a wasteful number, since it uses less digits than its factorization.

31113400123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2393338484.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31113400123 its reverse (32100431113), we get a palindrome (63213831236).

The spelling of 31113400123 in words is "thirty-one billion, one hundred thirteen million, four hundred thousand, one hundred twenty-three".