16091218 has 16 divisors (see below), whose sum is σ = 28357056. Its totient is φ = 6751440.

The previous prime is 16091183. The next prime is 16091221. The reversal of 16091218 is 81219061.

It is a happy number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 27846 + ... + 28417.

It is an arithmetic number, because the mean of its divisors is an integer number (1772316).

Almost surely, 2^16091218 is an apocalyptic number.

16091218 is a deficient number, since it is larger than the sum of its proper divisors (12265838).

16091218 is a wasteful number, since it uses less digits than its factorization.

16091218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56289.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 16091218 is about 4011.3860447481. The cubic root of 16091218 is about 252.4621673213.

It can be divided in two parts, 160 and 91218, that added together give a triangular number (91378 = T₄₂₇).

The spelling of 16091218 in words is "sixteen million, ninety-one thousand, two hundred eighteen".