31120320123 has 48 divisors (see below), whose sum is σ = 48495283200. Its totient is φ = 19918755360.

The previous prime is 31120320107. The next prime is 31120320149. The reversal of 31120320123 is 32102302113.

31120320123 is a `hidden beast` number, since 311 + 20 + 320 + 12 + 3 = 666.

It is not a de Polignac number, because 31120320123 - 2⁴ = 31120320107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31120320096 and 31120320105.

It is not an unprimeable number, because it can be changed into a prime (31120320523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1249078 + ... + 1273748.

It is an arithmetic number, because the mean of its divisors is an integer number (1010318400).

Almost surely, 2^31120320123 is an apocalyptic number.

31120320123 is a deficient number, since it is larger than the sum of its proper divisors (17374963077).

31120320123 is a wasteful number, since it uses less digits than its factorization.

31120320123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24894 (or 24882 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31120320123 its reverse (32102302113), we get a palindrome (63222622236).

The spelling of 31120320123 in words is "thirty-one billion, one hundred twenty million, three hundred twenty thousand, one hundred twenty-three".