16945109 has 4 divisors (see below), whose sum is σ = 16963200. Its totient is φ = 16927020.

The previous prime is 16945099. The next prime is 16945121. The reversal of 16945109 is 90154961.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16945109 - 2¹² = 16941013 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 (16945909) 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, 7559 + ... + 9540.

It is an arithmetic number, because the mean of its divisors is an integer number (4240800).

Almost surely, 2^16945109 is an apocalyptic number.

It is an amenable number.

16945109 is a deficient number, since it is larger than the sum of its proper divisors (18091).

16945109 is an equidigital number, since it uses as much as digits as its factorization.

16945109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18090.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 16945109 is about 4116.4437321552. The cubic root of 16945109 is about 256.8511151457.

The spelling of 16945109 in words is "sixteen million, nine hundred forty-five thousand, one hundred nine".