16067981 has 2 divisors, whose sum is σ = 16067982. Its totient is φ = 16067980.

The previous prime is 16067963. The next prime is 16067993. The reversal of 16067981 is 18976061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12187081 + 3880900 = 3491^2 + 1970^2 .

It is a cyclic number.

It is not a de Polignac number, because 16067981 - 2⁶ = 16067917 is a prime.

It is a super-2 number, since 2×16067981² = 516360026832722, 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 (16067921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8033990 + 8033991.

It is an arithmetic number, because the mean of its divisors is an integer number (8033991).

Almost surely, 2^16067981 is an apocalyptic number.

It is an amenable number.

16067981 is a deficient number, since it is larger than the sum of its proper divisors (1).

16067981 is an equidigital number, since it uses as much as digits as its factorization.

16067981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 16067981 is about 4008.4886179207. The cubic root of 16067981 is about 252.3405836200.

The spelling of 16067981 in words is "sixteen million, sixty-seven thousand, nine hundred eighty-one".