17091661 has 2 divisors, whose sum is σ = 17091662. Its totient is φ = 17091660.

The previous prime is 17091637. The next prime is 17091667. The reversal of 17091661 is 16619071.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9418761 + 7672900 = 3069^2 + 2770^2 .

It is a cyclic number.

It is not a de Polignac number, because 17091661 - 2⁹ = 17091149 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17091667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8545830 + 8545831.

It is an arithmetic number, because the mean of its divisors is an integer number (8545831).

Almost surely, 2^17091661 is an apocalyptic number.

It is an amenable number.

17091661 is a deficient number, since it is larger than the sum of its proper divisors (1).

17091661 is an equidigital number, since it uses as much as digits as its factorization.

17091661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 17091661 is about 4134.2062115961. The cubic root of 17091661 is about 257.5894608566.

The spelling of 17091661 in words is "seventeen million, ninety-one thousand, six hundred sixty-one".