31012103123 has 4 divisors (see below), whose sum is σ = 31012680000. Its totient is φ = 31011526248.

The previous prime is 31012103081. The next prime is 31012103131. The reversal of 31012103123 is 32130121013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32130121013 = 37 ⋅868381649.

It is a cyclic number.

It is not a de Polignac number, because 31012103123 - 2⁸ = 31012102867 is a prime.

It is a super-2 number, since 2×31012103123² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31012103623) 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, 198440 + ... + 318437.

It is an arithmetic number, because the mean of its divisors is an integer number (7753170000).

Almost surely, 2^31012103123 is an apocalyptic number.

31012103123 is a deficient number, since it is larger than the sum of its proper divisors (576877).

31012103123 is an equidigital number, since it uses as much as digits as its factorization.

31012103123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576876.

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

Adding to 31012103123 its reverse (32130121013), we get a palindrome (63142224136).

The spelling of 31012103123 in words is "thirty-one billion, twelve million, one hundred three thousand, one hundred twenty-three".