842518123 has 2 divisors, whose sum is σ = 842518124. Its totient is φ = 842518122.

The previous prime is 842518097. The next prime is 842518199. The reversal of 842518123 is 321815248.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 842518123 - 2⁵ = 842518091 is a prime.

It is not a weakly prime, because it can be changed into another prime (842518423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421259061 + 421259062.

It is an arithmetic number, because the mean of its divisors is an integer number (421259062).

Almost surely, 2^842518123 is an apocalyptic number.

842518123 is a deficient number, since it is larger than the sum of its proper divisors (1).

842518123 is an equidigital number, since it uses as much as digits as its factorization.

842518123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15360, while the sum is 34.

The square root of 842518123 is about 29026.1627329552. The cubic root of 842518123 is about 944.4806915049.

The spelling of 842518123 in words is "eight hundred forty-two million, five hundred eighteen thousand, one hundred twenty-three".