16809197 has 2 divisors, whose sum is σ = 16809198. Its totient is φ = 16809196.

The previous prime is 16809193. The next prime is 16809203. The reversal of 16809197 is 79190861.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16801801 + 7396 = 4099^2 + 86^2 .

It is a cyclic number.

It is not a de Polignac number, because 16809197 - 2² = 16809193 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16809193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8404598 + 8404599.

It is an arithmetic number, because the mean of its divisors is an integer number (8404599).

Almost surely, 2^16809197 is an apocalyptic number.

It is an amenable number.

16809197 is a deficient number, since it is larger than the sum of its proper divisors (1).

16809197 is an equidigital number, since it uses as much as digits as its factorization.

16809197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 16809197 is about 4099.9020720012. The cubic root of 16809197 is about 256.1625605295.

The spelling of 16809197 in words is "sixteen million, eight hundred nine thousand, one hundred ninety-seven".