31020131123 has 4 divisors (see below), whose sum is σ = 31020550248. Its totient is φ = 31019712000.

The previous prime is 31020131113. The next prime is 31020131147. The reversal of 31020131123 is 32113102013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32113102013 = 45497 ⋅705829.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31020131123 is a prime.

It is a super-2 number, since 2×31020131123² (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 (31020131113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65561 + ... + 257562.

It is an arithmetic number, because the mean of its divisors is an integer number (7755137562).

Almost surely, 2^31020131123 is an apocalyptic number.

31020131123 is a deficient number, since it is larger than the sum of its proper divisors (419125).

31020131123 is an equidigital number, since it uses as much as digits as its factorization.

31020131123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419124.

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

Adding to 31020131123 its reverse (32113102013), we get a palindrome (63133233136).

The spelling of 31020131123 in words is "thirty-one billion, twenty million, one hundred thirty-one thousand, one hundred twenty-three".