870191 has 16 divisors (see below), whose sum is σ = 1056000. Its totient is φ = 716184.

The previous prime is 870173. The next prime is 870197. The reversal of 870191 is 191078.

It is not a de Polignac number, because 870191 - 2⁶ = 870127 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 870191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870197) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14720 + ... + 14778.

It is an arithmetic number, because the mean of its divisors is an integer number (66000).

2⁸⁷⁰¹⁹¹ is an apocalyptic number.

870191 is a deficient number, since it is larger than the sum of its proper divisors (185809).

870191 is an equidigital number, since it uses as much as digits as its factorization.

870191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 109 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 26.

The square root of 870191 is about 932.8402864371. The cubic root of 870191 is about 95.4710126472.

The spelling of 870191 in words is "eight hundred seventy thousand, one hundred ninety-one".