16321109 has 4 divisors (see below), whose sum is σ = 18652704. Its totient is φ = 13989516.

The previous prime is 16321103. The next prime is 16321127. The reversal of 16321109 is 90112361.

It is a happy number.

16321109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 16321109 - 2⁴ = 16321093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16321103) 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, 1165787 + ... + 1165800.

It is an arithmetic number, because the mean of its divisors is an integer number (4663176).

Almost surely, 2^16321109 is an apocalyptic number.

It is an amenable number.

16321109 is a deficient number, since it is larger than the sum of its proper divisors (2331595).

16321109 is an equidigital number, since it uses as much as digits as its factorization.

16321109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2331594.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 16321109 is about 4039.9392322162. The cubic root of 16321109 is about 253.6587736165.

The spelling of 16321109 in words is "sixteen million, three hundred twenty-one thousand, one hundred nine".