31213226 has 8 divisors (see below), whose sum is σ = 51076224. Its totient is φ = 14187820.

The previous prime is 31213213. The next prime is 31213243. The reversal of 31213226 is 62231213.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31213198 and 31213207.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 709370 + ... + 709413.

It is an arithmetic number, because the mean of its divisors is an integer number (6384528).

Almost surely, 2^31213226 is an apocalyptic number.

31213226 is a deficient number, since it is larger than the sum of its proper divisors (19862998).

31213226 is a wasteful number, since it uses less digits than its factorization.

31213226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1418796.

The product of its digits is 432, while the sum is 20.

The square root of 31213226 is about 5586.8798089810. The cubic root of 31213226 is about 314.8566610798.

Adding to 31213226 its reverse (62231213), we get a palindrome (93444439).

The spelling of 31213226 in words is "thirty-one million, two hundred thirteen thousand, two hundred twenty-six".