16091618 has 4 divisors (see below), whose sum is σ = 24137430. Its totient is φ = 8045808.

The previous prime is 16091611. The next prime is 16091627. The reversal of 16091618 is 81619061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12694969 + 3396649 = 3563^2 + 1843^2 .

It is not an unprimeable number, because it can be changed into a prime (16091611) 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, 4022903 + ... + 4022906.

Almost surely, 2^16091618 is an apocalyptic number.

16091618 is a deficient number, since it is larger than the sum of its proper divisors (8045812).

16091618 is an equidigital number, since it uses as much as digits as its factorization.

16091618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8045811.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 16091618 is about 4011.4359025167. The cubic root of 16091618 is about 252.4642592290.

The spelling of 16091618 in words is "sixteen million, ninety-one thousand, six hundred eighteen".