31325216 has 48 divisors (see below), whose sum is σ = 66901464. Its totient is φ = 14352384.

The previous prime is 31325209. The next prime is 31325233. The reversal of 31325216 is 61252313.

It can be written as a sum of positive squares in 4 ways, for example, as 31315216 + 10000 = 5596^2 + 100^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31325191 and 31325200.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106766 + ... + 107058.

Almost surely, 2^31325216 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 31325216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33450732).

31325216 is an abundant number, since it is smaller than the sum of its proper divisors (35576248).

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

31325216 is a wasteful number, since it uses less digits than its factorization.

31325216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573 (or 565 counting only the distinct ones).

The product of its digits is 1080, while the sum is 23.

The square root of 31325216 is about 5596.8934240344. The cubic root of 31325216 is about 315.2327699187.

Adding to 31325216 its reverse (61252313), we get a palindrome (92577529).

The spelling of 31325216 in words is "thirty-one million, three hundred twenty-five thousand, two hundred sixteen".