13181916 has 48 divisors (see below), whose sum is σ = 34473600. Its totient is φ = 3885120.

The previous prime is 13181911. The next prime is 13181933. The reversal of 13181916 is 61918131.

13181916 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13181911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3535 + ... + 6233.

It is an arithmetic number, because the mean of its divisors is an integer number (718200).

Almost surely, 2^13181916 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 13181916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17236800).

13181916 is an abundant number, since it is smaller than the sum of its proper divisors (21291684).

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

13181916 is a wasteful number, since it uses less digits than its factorization.

13181916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2754 (or 2752 counting only the distinct ones).

The product of its digits is 1296, while the sum is 30.

The square root of 13181916 is about 3630.6908433520. The cubic root of 13181916 is about 236.2251752981.

The spelling of 13181916 in words is "thirteen million, one hundred eighty-one thousand, nine hundred sixteen".