16958609 has 2 divisors, whose sum is σ = 16958610. Its totient is φ = 16958608.

The previous prime is 16958603. The next prime is 16958611. The reversal of 16958609 is 90685961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16851025 + 107584 = 4105^2 + 328^2 .

It is an emirp because it is prime and its reverse (90685961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16958609 - 2⁴ = 16958593 is a prime.

Together with 16958611, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16958609.

It is not a weakly prime, because it can be changed into another prime (16958603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8479304 + 8479305.

It is an arithmetic number, because the mean of its divisors is an integer number (8479305).

Almost surely, 2^16958609 is an apocalyptic number.

It is an amenable number.

16958609 is a deficient number, since it is larger than the sum of its proper divisors (1).

16958609 is an equidigital number, since it uses as much as digits as its factorization.

16958609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 16958609 is about 4118.0831706026. The cubic root of 16958609 is about 256.9193072835.

The spelling of 16958609 in words is "sixteen million, nine hundred fifty-eight thousand, six hundred nine".