16995891 has 16 divisors (see below), whose sum is σ = 24808320. Its totient is φ = 10264320.

The previous prime is 16995887. The next prime is 16995893. The reversal of 16995891 is 19859961.

It is not a de Polignac number, because 16995891 - 2² = 16995887 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16995891.

It is not an unprimeable number, because it can be changed into a prime (16995893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10920 + ... + 12378.

It is an arithmetic number, because the mean of its divisors is an integer number (1550520).

Almost surely, 2^16995891 is an apocalyptic number.

16995891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16995891 is a deficient number, since it is larger than the sum of its proper divisors (7812429).

16995891 is a wasteful number, since it uses less digits than its factorization.

16995891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1826.

The product of its digits is 174960, while the sum is 48.

The square root of 16995891 is about 4122.6073060625. The cubic root of 16995891 is about 257.1074409336.

The spelling of 16995891 in words is "sixteen million, nine hundred ninety-five thousand, eight hundred ninety-one".