31133424 has 160 divisors (see below), whose sum is σ = 98406400. Its totient is φ = 8467200.

The previous prime is 31133321. The next prime is 31133437. The reversal of 31133424 is 42433113.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 31133424.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 510354 + ... + 510414.

It is an arithmetic number, because the mean of its divisors is an integer number (615040).

Almost surely, 2^31133424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31133424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49203200).

31133424 is an abundant number, since it is smaller than the sum of its proper divisors (67272976).

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

31133424 is a wasteful number, since it uses less digits than its factorization.

31133424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124 (or 104 counting only the distinct ones).

The product of its digits is 864, while the sum is 21.

The square root of 31133424 is about 5579.7333269611. The cubic root of 31133424 is about 314.5881036112.

Adding to 31133424 its reverse (42433113), we get a palindrome (73566537).

The spelling of 31133424 in words is "thirty-one million, one hundred thirty-three thousand, four hundred twenty-four".