31112224 has 72 divisors (see below), whose sum is σ = 72494352. Its totient is φ = 13029120.

The previous prime is 31112209. The next prime is 31112281. The reversal of 31112224 is 42221113.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 31112198 and 31112207.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59227 + ... + 59749.

It is an arithmetic number, because the mean of its divisors is an integer number (1006866).

Almost surely, 2^31112224 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 31112224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36247176).

31112224 is an abundant number, since it is smaller than the sum of its proper divisors (41382128).

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

31112224 is a wasteful number, since it uses less digits than its factorization.

31112224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570 (or 549 counting only the distinct ones).

The product of its digits is 96, while the sum is 16.

The square root of 31112224 is about 5577.8332710830. The cubic root of 31112224 is about 314.5166821687.

Adding to 31112224 its reverse (42221113), we get a palindrome (73333337).

Subtracting 31112224 from its reverse (42221113), we obtain a square (11108889 = 3333²).

It can be divided in two parts, 3111 and 2224, that added together give a palindrome (5335).

The spelling of 31112224 in words is "thirty-one million, one hundred twelve thousand, two hundred twenty-four".