31223320231111 has 4 divisors (see below), whose sum is σ = 31380221338000. Its totient is φ = 31066419124224.

The previous prime is 31223320231073. The next prime is 31223320231189. The reversal of 31223320231111 is 11113202332213.

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-31223320231111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31223320231511) 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, 78450553146 + ... + 78450553543.

It is an arithmetic number, because the mean of its divisors is an integer number (7845055334500).

Almost surely, 2^{31223320231111} is an apocalyptic number.

31223320231111 is a deficient number, since it is larger than the sum of its proper divisors (156901106889).

31223320231111 is a wasteful number, since it uses less digits than its factorization.

31223320231111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156901106888.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 31223320231111 its reverse (11113202332213), we get a palindrome (42336522563324).

The spelling of 31223320231111 in words is "thirty-one trillion, two hundred twenty-three billion, three hundred twenty million, two hundred thirty-one thousand, one hundred eleven".