31323321023 has 4 divisors (see below), whose sum is σ = 31324121088. Its totient is φ = 31322520960.

The previous prime is 31323321013. The next prime is 31323321031. The reversal of 31323321023 is 32012332313.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31323321023 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31323321023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31323321013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 338111 + ... + 420672.

It is an arithmetic number, because the mean of its divisors is an integer number (7831030272).

Almost surely, 2^31323321023 is an apocalyptic number.

31323321023 is a deficient number, since it is larger than the sum of its proper divisors (800065).

31323321023 is an equidigital number, since it uses as much as digits as its factorization.

31323321023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800064.

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

Adding to 31323321023 its reverse (32012332313), we get a palindrome (63335653336).

The spelling of 31323321023 in words is "thirty-one billion, three hundred twenty-three million, three hundred twenty-one thousand, twenty-three".