16798181 has 2 divisors, whose sum is σ = 16798182. Its totient is φ = 16798180.

The previous prime is 16798157. The next prime is 16798189. The reversal of 16798181 is 18189761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14753281 + 2044900 = 3841^2 + 1430^2 .

It is a cyclic number.

It is not a de Polignac number, because 16798181 - 2¹⁴ = 16781797 is a prime.

It is a super-2 number, since 2×16798181² = 564357769817522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16798189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8399090 + 8399091.

It is an arithmetic number, because the mean of its divisors is an integer number (8399091).

Almost surely, 2^16798181 is an apocalyptic number.

It is an amenable number.

16798181 is a deficient number, since it is larger than the sum of its proper divisors (1).

16798181 is an equidigital number, since it uses as much as digits as its factorization.

16798181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 41.

The square root of 16798181 is about 4098.5584050981. The cubic root of 16798181 is about 256.1065891182.

The spelling of 16798181 in words is "sixteen million, seven hundred ninety-eight thousand, one hundred eighty-one".