842181091 has 2 divisors, whose sum is σ = 842181092. Its totient is φ = 842181090.

The previous prime is 842181073. The next prime is 842181097. The reversal of 842181091 is 190181248.

842181091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 842181091 - 2¹¹ = 842179043 is a prime.

It is not a weakly prime, because it can be changed into another prime (842181097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421090545 + 421090546.

It is an arithmetic number, because the mean of its divisors is an integer number (421090546).

Almost surely, 2^842181091 is an apocalyptic number.

842181091 is a deficient number, since it is larger than the sum of its proper divisors (1).

842181091 is an equidigital number, since it uses as much as digits as its factorization.

842181091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 842181091 is about 29020.3564933307. The cubic root of 842181091 is about 944.3547347004.

The spelling of 842181091 in words is "eight hundred forty-two million, one hundred eighty-one thousand, ninety-one".