31323123223 has 16 divisors (see below), whose sum is σ = 36103601664. Its totient is φ = 26619821280.

The previous prime is 31323123193. The next prime is 31323123269. The reversal of 31323123223 is 32232132313.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31323123223 is a prime.

It is a super-2 number, since 2×31323123223² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31323123023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 482718 + ... + 543748.

It is an arithmetic number, because the mean of its divisors is an integer number (2256475104).

Almost surely, 2^31323123223 is an apocalyptic number.

31323123223 is a deficient number, since it is larger than the sum of its proper divisors (4780478441).

31323123223 is a wasteful number, since it uses less digits than its factorization.

31323123223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61662.

The product of its digits is 3888, while the sum is 25.

Adding to 31323123223 its reverse (32232132313), we get a palindrome (63555255536).

The spelling of 31323123223 in words is "thirty-one billion, three hundred twenty-three million, one hundred twenty-three thousand, two hundred twenty-three".