842591 has 4 divisors (see below), whose sum is σ = 863184. Its totient is φ = 822000.

The previous prime is 842587. The next prime is 842599. The reversal of 842591 is 195248.

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 842591 - 2² = 842587 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842599) 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, 10235 + ... + 10316.

It is an arithmetic number, because the mean of its divisors is an integer number (215796).

2⁸⁴²⁵⁹¹ is an apocalyptic number.

842591 is a deficient number, since it is larger than the sum of its proper divisors (20593).

842591 is a wasteful number, since it uses less digits than its factorization.

842591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20592.

The product of its digits is 2880, while the sum is 29.

The square root of 842591 is about 917.9275570545. The cubic root of 842591 is about 94.4507922941.

The spelling of 842591 in words is "eight hundred forty-two thousand, five hundred ninety-one".