31313220323 has 16 divisors (see below), whose sum is σ = 39045477120. Its totient is φ = 24396400800.

The previous prime is 31313220319. The next prime is 31313220331. The reversal of 31313220323 is 32302231313.

It is a cyclic number.

It is not a de Polignac number, because 31313220323 - 2² = 31313220319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31313220923) 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, 595313 + ... + 645773.

It is an arithmetic number, because the mean of its divisors is an integer number (2440342320).

Almost surely, 2^31313220323 is an apocalyptic number.

31313220323 is a deficient number, since it is larger than the sum of its proper divisors (7732256797).

31313220323 is a wasteful number, since it uses less digits than its factorization.

31313220323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58538.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 31313220323 its reverse (32302231313), we get a palindrome (63615451636).

The spelling of 31313220323 in words is "thirty-one billion, three hundred thirteen million, two hundred twenty thousand, three hundred twenty-three".