870091 has 4 divisors (see below), whose sum is σ = 874152. Its totient is φ = 866032.

The previous prime is 870083. The next prime is 870097. The reversal of 870091 is 190078.

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 870091 - 2³ = 870083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (870097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1690 + ... + 2143.

It is an arithmetic number, because the mean of its divisors is an integer number (218538).

2⁸⁷⁰⁰⁹¹ is an apocalyptic number.

870091 is a deficient number, since it is larger than the sum of its proper divisors (4061).

870091 is a wasteful number, since it uses less digits than its factorization.

870091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4060.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 870091 is about 932.7866851537. The cubic root of 870091 is about 95.4673554168.

The spelling of 870091 in words is "eight hundred seventy thousand, ninety-one".