16505911 has 2 divisors, whose sum is σ = 16505912. Its totient is φ = 16505910.

The previous prime is 16505837. The next prime is 16505921. The reversal of 16505911 is 11950561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16505911 - 2⁹ = 16505399 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16505911.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16505921) 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, 8252955 + 8252956.

It is an arithmetic number, because the mean of its divisors is an integer number (8252956).

Almost surely, 2^16505911 is an apocalyptic number.

16505911 is a deficient number, since it is larger than the sum of its proper divisors (1).

16505911 is an equidigital number, since it uses as much as digits as its factorization.

16505911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 28.

The square root of 16505911 is about 4062.7467309691. The cubic root of 16505911 is about 254.6125655645.

The spelling of 16505911 in words is "sixteen million, five hundred five thousand, nine hundred eleven".