16000981 has 2 divisors, whose sum is σ = 16000982. Its totient is φ = 16000980.

The previous prime is 16000979. The next prime is 16000987. The reversal of 16000981 is 18900061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15928081 + 72900 = 3991^2 + 270^2 .

It is an emirp because it is prime and its reverse (18900061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16000981 - 2¹ = 16000979 is a prime.

It is a super-2 number, since 2×16000981² = 512062785924722, which contains 22 as substring.

Together with 16000979, 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 (16000987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8000490 + 8000491.

It is an arithmetic number, because the mean of its divisors is an integer number (8000491).

Almost surely, 2^16000981 is an apocalyptic number.

It is an amenable number.

16000981 is a deficient number, since it is larger than the sum of its proper divisors (1).

16000981 is an equidigital number, since it uses as much as digits as its factorization.

16000981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 16000981 is about 4000.1226231204. The cubic root of 16000981 is about 251.9893598010.

The spelling of 16000981 in words is "sixteen million, nine hundred eighty-one", and thus it is an aban number.