17198981 has 2 divisors, whose sum is σ = 17198982. Its totient is φ = 17198980.

The previous prime is 17198953. The next prime is 17198989. The reversal of 17198981 is 18989171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17181025 + 17956 = 4145^2 + 134^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17198981 is a prime.

It is a super-2 number, since 2×17198981² = 591609894876722, 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 (17198989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8599490 + 8599491.

It is an arithmetic number, because the mean of its divisors is an integer number (8599491).

Almost surely, 2^17198981 is an apocalyptic number.

It is an amenable number.

17198981 is a deficient number, since it is larger than the sum of its proper divisors (1).

17198981 is an equidigital number, since it uses as much as digits as its factorization.

17198981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 44.

The square root of 17198981 is about 4147.1654174870. The cubic root of 17198981 is about 258.1274784160.

The spelling of 17198981 in words is "seventeen million, one hundred ninety-eight thousand, nine hundred eighty-one".