842091 has 4 divisors (see below), whose sum is σ = 1122792. Its totient is φ = 561392.

The previous prime is 842089. The next prime is 842111. The reversal of 842091 is 190248.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 842091 - 2¹ = 842089 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (842021) 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, 140346 + ... + 140351.

It is an arithmetic number, because the mean of its divisors is an integer number (280698).

2⁸⁴²⁰⁹¹ is an apocalyptic number.

842091 is a deficient number, since it is larger than the sum of its proper divisors (280701).

842091 is a wasteful number, since it uses less digits than its factorization.

842091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280700.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 842091 is about 917.6551639914. The cubic root of 842091 is about 94.4321059878.

The spelling of 842091 in words is "eight hundred forty-two thousand, ninety-one".