31316416 has 28 divisors (see below), whose sum is σ = 63004192. Its totient is φ = 15441408.

The previous prime is 31316413. The next prime is 31316423. The reversal of 31316416 is 61461313.

It is a happy number.

It is a super-2 number, since 2×31316416² = 1961435822170112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31316413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1321 + ... + 8023.

Almost surely, 2^31316416 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 31316416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31502096).

31316416 is an abundant number, since it is smaller than the sum of its proper divisors (31687776).

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

31316416 is an equidigital number, since it uses as much as digits as its factorization.

31316416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6788 (or 6778 counting only the distinct ones).

The product of its digits is 1296, while the sum is 25.

The square root of 31316416 is about 5596.1072184153. The cubic root of 31316416 is about 315.2032483539.

Adding to 31316416 its reverse (61461313), we get a palindrome (92777729).

The spelling of 31316416 in words is "thirty-one million, three hundred sixteen thousand, four hundred sixteen".