16091939 has 4 divisors (see below), whose sum is σ = 16115040. Its totient is φ = 16068840.

The previous prime is 16091923. The next prime is 16091951. The reversal of 16091939 is 93919061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93919061 = 37 ⋅2538353.

It is a cyclic number.

It is not a de Polignac number, because 16091939 - 2⁴ = 16091923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16091989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10472 + ... + 11909.

It is an arithmetic number, because the mean of its divisors is an integer number (4028760).

Almost surely, 2^16091939 is an apocalyptic number.

16091939 is a deficient number, since it is larger than the sum of its proper divisors (23101).

16091939 is an equidigital number, since it uses as much as digits as its factorization.

16091939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23100.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 16091939 is about 4011.4759129278. The cubic root of 16091939 is about 252.4659379599.

The spelling of 16091939 in words is "sixteen million, ninety-one thousand, nine hundred thirty-nine".