31231222 has 16 divisors (see below), whose sum is σ = 51224400. Its totient is φ = 14163040.

The previous prime is 31231139. The next prime is 31231223. The reversal of 31231222 is 22213213.

It is a super-2 number, since 2×31231222² = 1950778455226568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31231196 and 31231205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9804 + ... + 12592.

It is an arithmetic number, because the mean of its divisors is an integer number (3201525).

Almost surely, 2^31231222 is an apocalyptic number.

31231222 is a deficient number, since it is larger than the sum of its proper divisors (19993178).

31231222 is a wasteful number, since it uses less digits than its factorization.

31231222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3311.

The product of its digits is 144, while the sum is 16.

The square root of 31231222 is about 5588.4901359849. The cubic root of 31231222 is about 314.9171597060.

Adding to 31231222 its reverse (22213213), we get a palindrome (53444435).

Subtracting from 31231222 its reverse (22213213), we obtain a square (9018009 = 3003²).

The spelling of 31231222 in words is "thirty-one million, two hundred thirty-one thousand, two hundred twenty-two".