31213323 has 16 divisors (see below), whose sum is σ = 48253440. Its totient is φ = 19903752.

The previous prime is 31213321. The next prime is 31213363. The reversal of 31213323 is 32331213.

It is not a de Polignac number, because 31213323 - 2¹ = 31213321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31213296 and 31213305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24511 + ... + 25752.

It is an arithmetic number, because the mean of its divisors is an integer number (3015840).

Almost surely, 2^31213323 is an apocalyptic number.

31213323 is a deficient number, since it is larger than the sum of its proper divisors (17040117).

31213323 is a wasteful number, since it uses less digits than its factorization.

31213323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50295 (or 50289 counting only the distinct ones).

The product of its digits is 324, while the sum is 18.

The square root of 31213323 is about 5586.8884900273. Note that the first 3 decimals coincide. The cubic root of 31213323 is about 314.8569872350.

Adding to 31213323 its reverse (32331213), we get a palindrome (63544536).

The spelling of 31213323 in words is "thirty-one million, two hundred thirteen thousand, three hundred twenty-three".