16222391 has 4 divisors (see below), whose sum is σ = 16660872. Its totient is φ = 15783912.

The previous prime is 16222387. The next prime is 16222417. The reversal of 16222391 is 19322261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19322261 = 7 ⋅2760323.

It is a cyclic number.

It is not a de Polignac number, because 16222391 - 2² = 16222387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16222391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16222321) 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, 219185 + ... + 219258.

It is an arithmetic number, because the mean of its divisors is an integer number (4165218).

Almost surely, 2^16222391 is an apocalyptic number.

16222391 is a deficient number, since it is larger than the sum of its proper divisors (438481).

16222391 is an equidigital number, since it uses as much as digits as its factorization.

16222391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438480.

The product of its digits is 1296, while the sum is 26.

The square root of 16222391 is about 4027.7029433661. The cubic root of 16222391 is about 253.1463218538.

The spelling of 16222391 in words is "sixteen million, two hundred twenty-two thousand, three hundred ninety-one".