16133681 has 2 divisors, whose sum is σ = 16133682. Its totient is φ = 16133680.

The previous prime is 16133647. The next prime is 16133713. The reversal of 16133681 is 18633161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16120225 + 13456 = 4015^2 + 116^2 .

It is an emirp because it is prime and its reverse (18633161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16133681 - 2¹⁰ = 16132657 is a prime.

It is a super-2 number, since 2×16133681² = 520591325219522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16132681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8066840 + 8066841.

It is an arithmetic number, because the mean of its divisors is an integer number (8066841).

Almost surely, 2^16133681 is an apocalyptic number.

It is an amenable number.

16133681 is a deficient number, since it is larger than the sum of its proper divisors (1).

16133681 is an equidigital number, since it uses as much as digits as its factorization.

16133681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 29.

The square root of 16133681 is about 4016.6753665189. The cubic root of 16133681 is about 252.6840457998.

The spelling of 16133681 in words is "sixteen million, one hundred thirty-three thousand, six hundred eighty-one".