17159921 has 2 divisors, whose sum is σ = 17159922. Its totient is φ = 17159920.

The previous prime is 17159887. The next prime is 17159929. The reversal of 17159921 is 12995171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16313521 + 846400 = 4039^2 + 920^2 .

It is a cyclic number.

It is not a de Polignac number, because 17159921 - 2¹⁴ = 17143537 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (17159929) 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, 8579960 + 8579961.

It is an arithmetic number, because the mean of its divisors is an integer number (8579961).

Almost surely, 2^17159921 is an apocalyptic number.

It is an amenable number.

17159921 is a deficient number, since it is larger than the sum of its proper divisors (1).

17159921 is an equidigital number, since it uses as much as digits as its factorization.

17159921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5670, while the sum is 35.

The square root of 17159921 is about 4142.4535000408. The cubic root of 17159921 is about 257.9319222260.

The spelling of 17159921 in words is "seventeen million, one hundred fifty-nine thousand, nine hundred twenty-one".