16078681 has 2 divisors, whose sum is σ = 16078682. Its totient is φ = 16078680.

The previous prime is 16078669. The next prime is 16078687. The reversal of 16078681 is 18687061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10342656 + 5736025 = 3216^2 + 2395^2 .

It is an emirp because it is prime and its reverse (18687061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16078681 - 2⁹ = 16078169 is a prime.

It is a super-2 number, since 2×16078681² = 517047965399522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16078681.

It is not a weakly prime, because it can be changed into another prime (16078687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8039340 + 8039341.

It is an arithmetic number, because the mean of its divisors is an integer number (8039341).

Almost surely, 2^16078681 is an apocalyptic number.

It is an amenable number.

16078681 is a deficient number, since it is larger than the sum of its proper divisors (1).

16078681 is an equidigital number, since it uses as much as digits as its factorization.

16078681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 16078681 is about 4009.8230634281. The cubic root of 16078681 is about 252.3965841245.

The spelling of 16078681 in words is "sixteen million, seventy-eight thousand, six hundred eighty-one".