291889 has 4 divisors (see below), whose sum is σ = 314356. Its totient is φ = 269424.

The previous prime is 291887. The next prime is 291899. The reversal of 291889 is 988192.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36864 + 255025 = 192^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 291889 - 2¹ = 291887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (291887) 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, 11214 + ... + 11239.

It is an arithmetic number, because the mean of its divisors is an integer number (78589).

2²⁹¹⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

291889 is a deficient number, since it is larger than the sum of its proper divisors (22467).

291889 is a wasteful number, since it uses less digits than its factorization.

291889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22466.

The product of its digits is 10368, while the sum is 37.

The square root of 291889 is about 540.2675263238. The cubic root of 291889 is about 66.3344668431.

The spelling of 291889 in words is "two hundred ninety-one thousand, eight hundred eighty-nine".