16516091 has 4 divisors (see below), whose sum is σ = 16748784. Its totient is φ = 16283400.

The previous prime is 16516063. The next prime is 16516099. The reversal of 16516091 is 19061561.

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

It is a cyclic number.

It is not a de Polignac number, because 16516091 - 2¹⁰ = 16515067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16516099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116240 + ... + 116381.

It is an arithmetic number, because the mean of its divisors is an integer number (4187196).

Almost surely, 2^16516091 is an apocalyptic number.

16516091 is a deficient number, since it is larger than the sum of its proper divisors (232693).

16516091 is an equidigital number, since it uses as much as digits as its factorization.

16516091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232692.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 16516091 is about 4063.9993848425. Note that the first 3 decimals coincide. The cubic root of 16516091 is about 254.6648988011.

The spelling of 16516091 in words is "sixteen million, five hundred sixteen thousand, ninety-one".