31223 has 2 divisors, whose sum is σ = 31224. Its totient is φ = 31222.

The previous prime is 31219. The next prime is 31231. The reversal of 31223 is 32213.

It is a weak prime.

31223 is a truncatable prime.

It is an emirp because it is prime and its reverse (32213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31223 - 2² = 31219 is a prime.

It is a plaindrome in base 13.

It is a nialpdrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15611 + 15612.

It is an arithmetic number, because the mean of its divisors is an integer number (15612).

2³¹²²³ is an apocalyptic number.

31223 is a deficient number, since it is larger than the sum of its proper divisors (1).

31223 is an equidigital number, since it uses as much as digits as its factorization.

31223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36, while the sum is 11.

The square root of 31223 is about 176.7003112618. The cubic root of 31223 is about 31.4889522020.

Adding to 31223 its reverse (32213), we get a palindrome (63436).

Subtracting 31223 from its reverse (32213), we obtain a triangular number (990 = T₄₄).

It can be divided in two parts, 3122 and 3, that added together give a 5-th power (3125 = 5⁵).

The spelling of 31223 in words is "thirty-one thousand, two hundred twenty-three".