31113223 has 2 divisors, whose sum is σ = 31113224. Its totient is φ = 31113222.

The previous prime is 31113221. The next prime is 31113253. The reversal of 31113223 is 32231113.

It is a weak prime.

It is an emirp because it is prime and its reverse (32231113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31113223 - 2¹ = 31113221 is a prime.

Together with 31113221, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 31113197 and 31113206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31113221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15556611 + 15556612.

It is an arithmetic number, because the mean of its divisors is an integer number (15556612).

Almost surely, 2^31113223 is an apocalyptic number.

31113223 is a deficient number, since it is larger than the sum of its proper divisors (1).

31113223 is an equidigital number, since it uses as much as digits as its factorization.

31113223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108, while the sum is 16.

The square root of 31113223 is about 5577.9228212660. The cubic root of 31113223 is about 314.5200484640.

Adding to 31113223 its reverse (32231113), we get a palindrome (63344336).

The spelling of 31113223 in words is "thirty-one million, one hundred thirteen thousand, two hundred twenty-three".