16338181 has 2 divisors, whose sum is σ = 16338182. Its totient is φ = 16338180.

The previous prime is 16338167. The next prime is 16338197. The reversal of 16338181 is 18183361.

16338181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16273156 + 65025 = 4034^2 + 255^2 .

It is a cyclic number.

It is not a de Polignac number, because 16338181 - 2²³ = 7949573 is a prime.

It is a super-4 number, since 4×16338181⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16338121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8169090 + 8169091.

It is an arithmetic number, because the mean of its divisors is an integer number (8169091).

Almost surely, 2^16338181 is an apocalyptic number.

It is an amenable number.

16338181 is a deficient number, since it is larger than the sum of its proper divisors (1).

16338181 is an equidigital number, since it uses as much as digits as its factorization.

16338181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 31.

The square root of 16338181 is about 4042.0515830454. The cubic root of 16338181 is about 253.7471857777.

The spelling of 16338181 in words is "sixteen million, three hundred thirty-eight thousand, one hundred eighty-one".