16538999 has 2 divisors, whose sum is σ = 16539000. Its totient is φ = 16538998.

The previous prime is 16538983. The next prime is 16539041. The reversal of 16538999 is 99983561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16538999 - 2⁴ = 16538983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16538969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8269499 + 8269500.

It is an arithmetic number, because the mean of its divisors is an integer number (8269500).

Almost surely, 2^16538999 is an apocalyptic number.

16538999 is a deficient number, since it is larger than the sum of its proper divisors (1).

16538999 is an equidigital number, since it uses as much as digits as its factorization.

16538999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 524880, while the sum is 50.

The square root of 16538999 is about 4066.8168141681. The cubic root of 16538999 is about 254.7825854129.

The spelling of 16538999 in words is "sixteen million, five hundred thirty-eight thousand, nine hundred ninety-nine".