16278161 has 2 divisors, whose sum is σ = 16278162. Its totient is φ = 16278160.

The previous prime is 16278133. The next prime is 16278211. The reversal of 16278161 is 16187261.

It is a happy number.

16278161 is nontrivially palindromic in base 11.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10368400 + 5909761 = 3220^2 + 2431^2 .

It is a cyclic number.

It is not a de Polignac number, because 16278161 - 2¹⁰ = 16277137 is a prime.

It is not a weakly prime, because it can be changed into another prime (16278461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8139080 + 8139081.

It is an arithmetic number, because the mean of its divisors is an integer number (8139081).

Almost surely, 2^16278161 is an apocalyptic number.

It is an amenable number.

16278161 is a deficient number, since it is larger than the sum of its proper divisors (1).

16278161 is an equidigital number, since it uses as much as digits as its factorization.

16278161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 32.

The square root of 16278161 is about 4034.6203043161. The cubic root of 16278161 is about 253.4360823203.

The spelling of 16278161 in words is "sixteen million, two hundred seventy-eight thousand, one hundred sixty-one".