16516009 has 2 divisors, whose sum is σ = 16516010. Its totient is φ = 16516008.

The previous prime is 16515973. The next prime is 16516013. The reversal of 16516009 is 90061561.

16516009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12981609 + 3534400 = 3603^2 + 1880^2 .

It is a cyclic number.

It is not a de Polignac number, because 16516009 - 2⁷ = 16515881 is a prime.

It is a super-3 number, since 3×16516009³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16516039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8258004 + 8258005.

It is an arithmetic number, because the mean of its divisors is an integer number (8258005).

Almost surely, 2^16516009 is an apocalyptic number.

It is an amenable number.

16516009 is a deficient number, since it is larger than the sum of its proper divisors (1).

16516009 is an equidigital number, since it uses as much as digits as its factorization.

16516009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 16516009 is about 4063.9892962457. The cubic root of 16516009 is about 254.6644773423.

The spelling of 16516009 in words is "sixteen million, five hundred sixteen thousand, nine".