31011312223 has 4 divisors (see below), whose sum is σ = 31016618248. Its totient is φ = 31006006200.

The previous prime is 31011312221. The next prime is 31011312253. The reversal of 31011312223 is 32221311013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32221311013 = 2719 ⋅11850427.

It is a cyclic number.

It is not a de Polignac number, because 31011312223 - 2¹ = 31011312221 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 31011312223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31011312221) 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, 2644236 + ... + 2655937.

It is an arithmetic number, because the mean of its divisors is an integer number (7754154562).

Almost surely, 2^31011312223 is an apocalyptic number.

31011312223 is a deficient number, since it is larger than the sum of its proper divisors (5306025).

31011312223 is an equidigital number, since it uses as much as digits as its factorization.

31011312223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5306024.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31011312223 its reverse (32221311013), we get a palindrome (63232623236).

The spelling of 31011312223 in words is "thirty-one billion, eleven million, three hundred twelve thousand, two hundred twenty-three".