16197811 has 4 divisors (see below), whose sum is σ = 18511792. Its totient is φ = 13883832.

The previous prime is 16197793. The next prime is 16197827. The reversal of 16197811 is 11879161.

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 16197811 - 2¹¹ = 16195763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16197011) 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, 1156980 + ... + 1156993.

It is an arithmetic number, because the mean of its divisors is an integer number (4627948).

Almost surely, 2^16197811 is an apocalyptic number.

16197811 is a deficient number, since it is larger than the sum of its proper divisors (2313981).

16197811 is an equidigital number, since it uses as much as digits as its factorization.

16197811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2313980.

The product of its digits is 3024, while the sum is 34.

The square root of 16197811 is about 4024.6504196017. The cubic root of 16197811 is about 253.0184023234.

The spelling of 16197811 in words is "sixteen million, one hundred ninety-seven thousand, eight hundred eleven".