2181316 has 6 divisors (see below), whose sum is σ = 3817310. Its totient is φ = 1090656.

The previous prime is 2181271. The next prime is 2181329. The reversal of 2181316 is 6131812.

It can be written as a sum of positive squares in only one way, i.e., 1201216 + 980100 = 1096^2 + 990^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272661 + ... + 272668.

2^2181316 is an apocalyptic number.

It is an amenable number.

2181316 is a deficient number, since it is larger than the sum of its proper divisors (1635994).

2181316 is a wasteful number, since it uses less digits than its factorization.

2181316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545333 (or 545331 counting only the distinct ones).

The product of its digits is 288, while the sum is 22.

The square root of 2181316 is about 1476.9278926204. The cubic root of 2181316 is about 129.6899118243.

The spelling of 2181316 in words is "two million, one hundred eighty-one thousand, three hundred sixteen".