31123323231 has 32 divisors (see below), whose sum is σ = 55717283328. Its totient is φ = 14924269440.

The previous prime is 31123323211. The next prime is 31123323233. The reversal of 31123323231 is 13232332113.

It is not a de Polignac number, because 31123323231 - 2⁶ = 31123323167 is a prime.

It is a super-2 number, since 2×31123323231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123323233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5179036 + ... + 5185041.

It is an arithmetic number, because the mean of its divisors is an integer number (1741165104).

Almost surely, 2^31123323231 is an apocalyptic number.

31123323231 is a deficient number, since it is larger than the sum of its proper divisors (24593960097).

31123323231 is a wasteful number, since it uses less digits than its factorization.

31123323231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10364111.

The product of its digits is 1944, while the sum is 24.

Adding to 31123323231 its reverse (13232332113), we get a palindrome (44355655344).

The spelling of 31123323231 in words is "thirty-one billion, one hundred twenty-three million, three hundred twenty-three thousand, two hundred thirty-one".