862091 has 4 divisors (see below), whose sum is σ = 863952. Its totient is φ = 860232.

The previous prime is 862067. The next prime is 862097. The reversal of 862091 is 190268.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-862091 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 862091.

It is not an unprimeable number, because it can be changed into a prime (862097) 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, 386 + ... + 1368.

It is an arithmetic number, because the mean of its divisors is an integer number (215988).

2⁸⁶²⁰⁹¹ is an apocalyptic number.

862091 is a deficient number, since it is larger than the sum of its proper divisors (1861).

862091 is an equidigital number, since it uses as much as digits as its factorization.

862091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 862091 is about 928.4885567415. The cubic root of 862091 is about 95.1738644330.

The spelling of 862091 in words is "eight hundred sixty-two thousand, ninety-one".