31220123031 has 16 divisors (see below), whose sum is σ = 46255672800. Its totient is φ = 20811777984.

The previous prime is 31220123027. The next prime is 31220123041. The reversal of 31220123031 is 13032102213.

It is not a de Polignac number, because 31220123031 - 2² = 31220123027 is a prime.

It is a super-2 number, since 2×31220123031² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31220122995 and 31220123013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220123021) 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 15 ways as a sum of consecutive naturals, for example, 374635 + ... + 450323.

It is an arithmetic number, because the mean of its divisors is an integer number (2890979550).

Almost surely, 2^31220123031 is an apocalyptic number.

31220123031 is a deficient number, since it is larger than the sum of its proper divisors (15035549769).

31220123031 is a wasteful number, since it uses less digits than its factorization.

31220123031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90975 (or 90969 counting only the distinct ones).

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

Adding to 31220123031 its reverse (13032102213), we get a palindrome (44252225244).

The spelling of 31220123031 in words is "thirty-one billion, two hundred twenty million, one hundred twenty-three thousand, thirty-one".