16396181 has 2 divisors, whose sum is σ = 16396182. Its totient is φ = 16396180.

The previous prime is 16396169. The next prime is 16396229. The reversal of 16396181 is 18169361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15673681 + 722500 = 3959^2 + 850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16396181 is a prime.

It is a super-2 number, since 2×16396181² = 537669502769522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16396111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8198090 + 8198091.

It is an arithmetic number, because the mean of its divisors is an integer number (8198091).

Almost surely, 2^16396181 is an apocalyptic number.

It is an amenable number.

16396181 is a deficient number, since it is larger than the sum of its proper divisors (1).

16396181 is an equidigital number, since it uses as much as digits as its factorization.

16396181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 35.

The square root of 16396181 is about 4049.2198013938. The cubic root of 16396181 is about 254.0470958613.

The spelling of 16396181 in words is "sixteen million, three hundred ninety-six thousand, one hundred eighty-one".