291289 has 4 divisors (see below), whose sum is σ = 306640. Its totient is φ = 275940.

The previous prime is 291287. The next prime is 291293. The reversal of 291289 is 982192.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 291289 - 2¹ = 291287 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 291289.

It is not an unprimeable number, because it can be changed into a prime (291287) 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, 7647 + ... + 7684.

It is an arithmetic number, because the mean of its divisors is an integer number (76660).

2²⁹¹²⁸⁹ is an apocalyptic number.

It is an amenable number.

291289 is a deficient number, since it is larger than the sum of its proper divisors (15351).

291289 is a wasteful number, since it uses less digits than its factorization.

291289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15350.

The product of its digits is 2592, while the sum is 31.

The square root of 291289 is about 539.7119602158. The cubic root of 291289 is about 66.2889838200.

The spelling of 291289 in words is "two hundred ninety-one thousand, two hundred eighty-nine".