31218418223 has 4 divisors (see below), whose sum is σ = 31219876800. Its totient is φ = 31216959648.

The previous prime is 31218418177. The next prime is 31218418237. The reversal of 31218418223 is 32281481213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32281481213 = 19 ⋅1699025327.

It is a cyclic number.

It is not a de Polignac number, because 31218418223 - 2¹⁰ = 31218417199 is a prime.

It is a super-2 number, since 2×31218418223² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31218418723) 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, 696698 + ... + 740151.

It is an arithmetic number, because the mean of its divisors is an integer number (7804969200).

Almost surely, 2^31218418223 is an apocalyptic number.

31218418223 is a deficient number, since it is larger than the sum of its proper divisors (1458577).

31218418223 is a wasteful number, since it uses less digits than its factorization.

31218418223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458576.

The product of its digits is 18432, while the sum is 35.

Adding to 31218418223 its reverse (32281481213), we get a palindrome (63499899436).

The spelling of 31218418223 in words is "thirty-one billion, two hundred eighteen million, four hundred eighteen thousand, two hundred twenty-three".