291859 has 4 divisors (see below), whose sum is σ = 307240. Its totient is φ = 276480.

The previous prime is 291857. The next prime is 291869. The reversal of 291859 is 958192.

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 291859 - 2¹ = 291857 is a prime.

It is a Duffinian number.

291859 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (291853) 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, 7662 + ... + 7699.

It is an arithmetic number, because the mean of its divisors is an integer number (76810).

2²⁹¹⁸⁵⁹ is an apocalyptic number.

291859 is a deficient number, since it is larger than the sum of its proper divisors (15381).

291859 is a wasteful number, since it uses less digits than its factorization.

291859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15380.

The product of its digits is 6480, while the sum is 34.

The square root of 291859 is about 540.2397615874. The cubic root of 291859 is about 66.3321941731.

The spelling of 291859 in words is "two hundred ninety-one thousand, eight hundred fifty-nine".