17128949 has 2 divisors, whose sum is σ = 17128950. Its totient is φ = 17128948.

The previous prime is 17128931. The next prime is 17128981. The reversal of 17128949 is 94982171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8614225 + 8514724 = 2935^2 + 2918^2 .

It is a cyclic number.

It is not a de Polignac number, because 17128949 - 2²⁰ = 16080373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17128049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8564474 + 8564475.

It is an arithmetic number, because the mean of its divisors is an integer number (8564475).

Almost surely, 2^17128949 is an apocalyptic number.

It is an amenable number.

17128949 is a deficient number, since it is larger than the sum of its proper divisors (1).

17128949 is an equidigital number, since it uses as much as digits as its factorization.

17128949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 41.

The square root of 17128949 is about 4138.7134474375. The cubic root of 17128949 is about 257.7766480345.

The spelling of 17128949 in words is "seventeen million, one hundred twenty-eight thousand, nine hundred forty-nine".