17985197 has 2 divisors, whose sum is σ = 17985198. Its totient is φ = 17985196.

The previous prime is 17985131. The next prime is 17985211. The reversal of 17985197 is 79158971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11115556 + 6869641 = 3334^2 + 2621^2 .

It is a cyclic number.

It is not a de Polignac number, because 17985197 - 2²⁴ = 1207981 is a prime.

It is a super-2 number, since 2×17985197² = 646934622257618, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17985127) 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, 8992598 + 8992599.

It is an arithmetic number, because the mean of its divisors is an integer number (8992599).

Almost surely, 2^17985197 is an apocalyptic number.

It is an amenable number.

17985197 is a deficient number, since it is larger than the sum of its proper divisors (1).

17985197 is an equidigital number, since it uses as much as digits as its factorization.

17985197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 47.

The square root of 17985197 is about 4240.8957780167. The cubic root of 17985197 is about 262.0022774310.

The spelling of 17985197 in words is "seventeen million, nine hundred eighty-five thousand, one hundred ninety-seven".