31223223 has 6 divisors (see below), whose sum is σ = 45100224. Its totient is φ = 20815476.

The previous prime is 31223219. The next prime is 31223239. The reversal of 31223223 is 32232213.

It is a happy number.

It is not a de Polignac number, because 31223223 - 2² = 31223219 is a prime.

It is a super-3 number, since 3×31223223³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31223196 and 31223205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31223243) 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 in 5 ways as a sum of consecutive naturals, for example, 1734615 + ... + 1734632.

It is an arithmetic number, because the mean of its divisors is an integer number (7516704).

Almost surely, 2^31223223 is an apocalyptic number.

31223223 is a deficient number, since it is larger than the sum of its proper divisors (13877001).

31223223 is a wasteful number, since it uses less digits than its factorization.

31223223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3469253 (or 3469250 counting only the distinct ones).

The product of its digits is 432, while the sum is 18.

The square root of 31223223 is about 5587.7744227912. The cubic root of 31223223 is about 314.8902716830.

Adding to 31223223 its reverse (32232213), we get a palindrome (63455436).

The spelling of 31223223 in words is "thirty-one million, two hundred twenty-three thousand, two hundred twenty-three".