31323111223 has 4 divisors (see below), whose sum is σ = 32684985648. Its totient is φ = 29961236800.

The previous prime is 31323111173. The next prime is 31323111283. The reversal of 31323111223 is 32211132313.

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

It is a cyclic number.

It is not a de Polignac number, because 31323111223 - 2⁹ = 31323110711 is a prime.

It is a super-2 number, since 2×31323111223² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31323111194 and 31323111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31323111283) 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 3 ways as a sum of consecutive naturals, for example, 680937178 + ... + 680937223.

It is an arithmetic number, because the mean of its divisors is an integer number (8171246412).

Almost surely, 2^31323111223 is an apocalyptic number.

31323111223 is a deficient number, since it is larger than the sum of its proper divisors (1361874425).

31323111223 is a wasteful number, since it uses less digits than its factorization.

31323111223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361874424.

The product of its digits is 648, while the sum is 22.

Adding to 31323111223 its reverse (32211132313), we get a palindrome (63534243536).

The spelling of 31323111223 in words is "thirty-one billion, three hundred twenty-three million, one hundred eleven thousand, two hundred twenty-three".