16191223 has 2 divisors, whose sum is σ = 16191224. Its totient is φ = 16191222.

The previous prime is 16191179. The next prime is 16191247. The reversal of 16191223 is 32219161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16191223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16191283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8095611 + 8095612.

It is an arithmetic number, because the mean of its divisors is an integer number (8095612).

Almost surely, 2^16191223 is an apocalyptic number.

16191223 is a deficient number, since it is larger than the sum of its proper divisors (1).

16191223 is an equidigital number, since it uses as much as digits as its factorization.

16191223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 25.

The square root of 16191223 is about 4023.8318801859. The cubic root of 16191223 is about 252.9840949866.

The spelling of 16191223 in words is "sixteen million, one hundred ninety-one thousand, two hundred twenty-three".