16968109 has 4 divisors (see below), whose sum is σ = 17288316. Its totient is φ = 16647904.

The previous prime is 16968079. The next prime is 16968131. The reversal of 16968109 is 90186961.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5745609 + 11222500 = 2397^2 + 3350^2 .

It is a cyclic number.

It is not a de Polignac number, because 16968109 - 2⁹ = 16967597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16968169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160024 + ... + 160129.

It is an arithmetic number, because the mean of its divisors is an integer number (4322079).

Almost surely, 2^16968109 is an apocalyptic number.

It is an amenable number.

16968109 is a deficient number, since it is larger than the sum of its proper divisors (320207).

16968109 is an equidigital number, since it uses as much as digits as its factorization.

16968109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320206.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 16968109 is about 4119.2364583743. The cubic root of 16968109 is about 256.9672726523.

The spelling of 16968109 in words is "sixteen million, nine hundred sixty-eight thousand, one hundred nine".