16152181 has 2 divisors, whose sum is σ = 16152182. Its totient is φ = 16152180.

The previous prime is 16152179. The next prime is 16152229. The reversal of 16152181 is 18125161.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15444900 + 707281 = 3930^2 + 841^2 .

It is an emirp because it is prime and its reverse (18125161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16152181 - 2¹ = 16152179 is a prime.

It is a super-2 number, since 2×16152181² = 521785902113522, which contains 22 as substring.

Together with 16152179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16152281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8076090 + 8076091.

It is an arithmetic number, because the mean of its divisors is an integer number (8076091).

Almost surely, 2^16152181 is an apocalyptic number.

It is an amenable number.

16152181 is a deficient number, since it is larger than the sum of its proper divisors (1).

16152181 is an equidigital number, since it uses as much as digits as its factorization.

16152181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 25.

The square root of 16152181 is about 4018.9776063074. The cubic root of 16152181 is about 252.7805906041.

The spelling of 16152181 in words is "sixteen million, one hundred fifty-two thousand, one hundred eighty-one".