31001222 has 12 divisors (see below), whose sum is σ = 54094140. Its totient is φ = 13286196.

The previous prime is 31001221. The next prime is 31001233. The reversal of 31001222 is 22210013.

It is a happy number.

It is a super-2 number, since 2×31001222² = 1922151530986568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31001221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 158072 + ... + 158267.

It is an arithmetic number, because the mean of its divisors is an integer number (4507845).

Almost surely, 2^31001222 is an apocalyptic number.

31001222 is a deficient number, since it is larger than the sum of its proper divisors (23092918).

31001222 is a wasteful number, since it uses less digits than its factorization.

31001222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316355 (or 316348 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 31001222 is about 5567.8741005881. The cubic root of 31001222 is about 314.1421928915.

Adding to 31001222 its reverse (22210013), we get a palindrome (53211235).

The spelling of 31001222 in words is "thirty-one million, one thousand, two hundred twenty-two".