31012120123 has 6 divisors (see below), whose sum is σ = 31079460444. Its totient is φ = 30944925396.

The previous prime is 31012120091. The next prime is 31012120151. The reversal of 31012120123 is 32102121013.

It is not a de Polignac number, because 31012120123 - 2⁵ = 31012120091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31012120097 and 31012120106.

It is not an unprimeable number, because it can be changed into a prime (31012120523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 142036 + ... + 286702.

It is an arithmetic number, because the mean of its divisors is an integer number (5179910074).

Almost surely, 2^31012120123 is an apocalyptic number.

31012120123 is a deficient number, since it is larger than the sum of its proper divisors (67340321).

31012120123 is an frugal number, since it uses more digits than its factorization.

31012120123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145593 (or 145130 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31012120123 its reverse (32102121013), we get a palindrome (63114241136).

The spelling of 31012120123 in words is "thirty-one billion, twelve million, one hundred twenty thousand, one hundred twenty-three".