864191 has 2 divisors, whose sum is σ = 864192. Its totient is φ = 864190.

The previous prime is 864169. The next prime is 864203. The reversal of 864191 is 191468.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 864191 - 2¹⁸ = 602047 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (864121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432095 + 432096.

It is an arithmetic number, because the mean of its divisors is an integer number (432096).

2⁸⁶⁴¹⁹¹ is an apocalyptic number.

864191 is a deficient number, since it is larger than the sum of its proper divisors (1).

864191 is an equidigital number, since it uses as much as digits as its factorization.

864191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 29.

The square root of 864191 is about 929.6187390538. The cubic root of 864191 is about 95.2510809714.

The spelling of 864191 in words is "eight hundred sixty-four thousand, one hundred ninety-one".