17097921 has 6 divisors (see below), whose sum is σ = 24697010. Its totient is φ = 11398608.

The previous prime is 17097911. The next prime is 17097923. The reversal of 17097921 is 12979071.

It can be written as a sum of positive squares in only one way, i.e., 13727025 + 3370896 = 3705^2 + 1836^2 .

It is not a de Polignac number, because 17097921 - 2⁷ = 17097793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17097923) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 949876 + ... + 949893.

Almost surely, 2^17097921 is an apocalyptic number.

It is an amenable number.

17097921 is a deficient number, since it is larger than the sum of its proper divisors (7599089).

17097921 is a wasteful number, since it uses less digits than its factorization.

17097921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1899775 (or 1899772 counting only the distinct ones).

The product of its (nonzero) digits is 7938, while the sum is 36.

The square root of 17097921 is about 4134.9632404654. The cubic root of 17097921 is about 257.6209052981.

The spelling of 17097921 in words is "seventeen million, ninety-seven thousand, nine hundred twenty-one".