31323223 has 2 divisors, whose sum is σ = 31323224. Its totient is φ = 31323222.

The previous prime is 31323203. The next prime is 31323251. The reversal of 31323223 is 32232313.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31323223 - 2¹⁷ = 31192151 is a prime.

It is a super-2 number, since 2×31323223² = 1962288598215458, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31323223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31323203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15661611 + 15661612.

It is an arithmetic number, because the mean of its divisors is an integer number (15661612).

Almost surely, 2^31323223 is an apocalyptic number.

31323223 is a deficient number, since it is larger than the sum of its proper divisors (1).

31323223 is an equidigital number, since it uses as much as digits as its factorization.

31323223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 19.

The square root of 31323223 is about 5596.7153760040. The cubic root of 31323223 is about 315.2260844396.

Adding to 31323223 its reverse (32232313), we get a palindrome (63555536).

The spelling of 31323223 in words is "thirty-one million, three hundred twenty-three thousand, two hundred twenty-three".