842191223 has 2 divisors, whose sum is σ = 842191224. Its totient is φ = 842191222.

The previous prime is 842191213. The next prime is 842191267. The reversal of 842191223 is 322191248.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 842191223 - 2⁶ = 842191159 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 842191223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (842191213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421095611 + 421095612.

It is an arithmetic number, because the mean of its divisors is an integer number (421095612).

Almost surely, 2^842191223 is an apocalyptic number.

842191223 is a deficient number, since it is larger than the sum of its proper divisors (1).

842191223 is an equidigital number, since it uses as much as digits as its factorization.

842191223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 32.

The square root of 842191223 is about 29020.5310599238. The cubic root of 842191223 is about 944.3585217575.

The spelling of 842191223 in words is "eight hundred forty-two million, one hundred ninety-one thousand, two hundred twenty-three".