18170197 has 2 divisors, whose sum is σ = 18170198. Its totient is φ = 18170196.

The previous prime is 18170189. The next prime is 18170221. The reversal of 18170197 is 79107181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12666481 + 5503716 = 3559^2 + 2346^2 .

It is a cyclic number.

It is not a de Polignac number, because 18170197 - 2³ = 18170189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18170147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9085098 + 9085099.

It is an arithmetic number, because the mean of its divisors is an integer number (9085099).

Almost surely, 2^18170197 is an apocalyptic number.

It is an amenable number.

18170197 is a deficient number, since it is larger than the sum of its proper divisors (1).

18170197 is an equidigital number, since it uses as much as digits as its factorization.

18170197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 34.

The square root of 18170197 is about 4262.6514049357. The cubic root of 18170197 is about 262.8975539156.

The spelling of 18170197 in words is "eighteen million, one hundred seventy thousand, one hundred ninety-seven".