31222242 has 24 divisors (see below), whose sum is σ = 67829580. Its totient is φ = 10379520.

The previous prime is 31222211. The next prime is 31222249. The reversal of 31222242 is 24222213.

It can be written as a sum of positive squares in 2 ways, for example, as 21986721 + 9235521 = 4689^2 + 3039^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (31222249) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5242 + ... + 9482.

Almost surely, 2^31222242 is an apocalyptic number.

31222242 is an abundant number, since it is smaller than the sum of its proper divisors (36607338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31222242 is a wasteful number, since it uses less digits than its factorization.

31222242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4658 (or 4655 counting only the distinct ones).

The product of its digits is 384, while the sum is 18.

The square root of 31222242 is about 5587.6866411781. The cubic root of 31222242 is about 314.8869738109.

Adding to 31222242 its reverse (24222213), we get a palindrome (55444455).

The spelling of 31222242 in words is "thirty-one million, two hundred twenty-two thousand, two hundred forty-two".