16089781 has 2 divisors, whose sum is σ = 16089782. Its totient is φ = 16089780.

The previous prime is 16089767. The next prime is 16089791. The reversal of 16089781 is 18798061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8439025 + 7650756 = 2905^2 + 2766^2 .

It is a cyclic number.

It is not a de Polignac number, because 16089781 - 2⁷ = 16089653 is a prime.

It is a super-2 number, since 2×16089781² = 517762105255922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16089721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8044890 + 8044891.

It is an arithmetic number, because the mean of its divisors is an integer number (8044891).

Almost surely, 2^16089781 is an apocalyptic number.

It is an amenable number.

16089781 is a deficient number, since it is larger than the sum of its proper divisors (1).

16089781 is an equidigital number, since it uses as much as digits as its factorization.

16089781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 16089781 is about 4011.2069256023. The cubic root of 16089781 is about 252.4546518568.

The spelling of 16089781 in words is "sixteen million, eighty-nine thousand, seven hundred eighty-one".