31421244 has 24 divisors (see below), whose sum is σ = 74322640. Its totient is φ = 10329984.

The previous prime is 31421233. The next prime is 31421249. The reversal of 31421244 is 44212413.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 31421244.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31421249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17059 + ... + 18810.

Almost surely, 2^31421244 is an apocalyptic number.

It is an amenable number.

31421244 is an abundant number, since it is smaller than the sum of its proper divisors (42901396).

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

31421244 is a wasteful number, since it uses less digits than its factorization.

31421244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35949 (or 35947 counting only the distinct ones).

The product of its digits is 768, while the sum is 21.

The square root of 31421244 is about 5605.4655471245. The cubic root of 31421244 is about 315.5545585243.

Adding to 31421244 its reverse (44212413), we get a palindrome (75633657).

The spelling of 31421244 in words is "thirty-one million, four hundred twenty-one thousand, two hundred forty-four".