31122312223 has 4 divisors (see below), whose sum is σ = 31129019928. Its totient is φ = 31115604520.

The previous prime is 31122312173. The next prime is 31122312281. The reversal of 31122312223 is 32221322113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32221322113 = 17 ⋅1895371889.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31122312223 is a prime.

It is a super-5 number, since 5×31122312223⁵ (a number of 54 digits) contains 55555 as substring. Note that it is a super-d number also for d = 3.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31122312194 and 31122312203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31122312523) 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, 3346888 + ... + 3356173.

It is an arithmetic number, because the mean of its divisors is an integer number (7782254982).

Almost surely, 2^31122312223 is an apocalyptic number.

31122312223 is a deficient number, since it is larger than the sum of its proper divisors (6707705).

31122312223 is an equidigital number, since it uses as much as digits as its factorization.

31122312223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6707704.

The product of its digits is 864, while the sum is 22.

Adding to 31122312223 its reverse (32221322113), we get a palindrome (63343634336).

The spelling of 31122312223 in words is "thirty-one billion, one hundred twenty-two million, three hundred twelve thousand, two hundred twenty-three".