16533409 has 2 divisors, whose sum is σ = 16533410. Its totient is φ = 16533408.

The previous prime is 16533383. The next prime is 16533421. The reversal of 16533409 is 90433561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8832784 + 7700625 = 2972^2 + 2775^2 .

It is a cyclic number.

It is not a de Polignac number, because 16533409 - 2¹⁵ = 16500641 is a prime.

It is a super-2 number, since 2×16533409² = 546707226322562, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16533449) 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, 8266704 + 8266705.

It is an arithmetic number, because the mean of its divisors is an integer number (8266705).

Almost surely, 2^16533409 is an apocalyptic number.

It is an amenable number.

16533409 is a deficient number, since it is larger than the sum of its proper divisors (1).

16533409 is an equidigital number, since it uses as much as digits as its factorization.

16533409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 16533409 is about 4066.1294863789. The cubic root of 16533409 is about 254.7538776065.

The spelling of 16533409 in words is "sixteen million, five hundred thirty-three thousand, four hundred nine".