31623223 has 2 divisors, whose sum is σ = 31623224. Its totient is φ = 31623222.

The previous prime is 31623211. The next prime is 31623257. The reversal of 31623223 is 32232613.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31623223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31623194 and 31623203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31623023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15811611 + 15811612.

It is an arithmetic number, because the mean of its divisors is an integer number (15811612).

Almost surely, 2^31623223 is an apocalyptic number.

31623223 is a deficient number, since it is larger than the sum of its proper divisors (1).

31623223 is an equidigital number, since it uses as much as digits as its factorization.

31623223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 22.

The square root of 31623223 is about 5623.4529428101. The cubic root of 31623223 is about 316.2292540042.

Adding to 31623223 its reverse (32232613), we get a palindrome (63855836).

The spelling of 31623223 in words is "thirty-one million, six hundred twenty-three thousand, two hundred twenty-three".