291389 has 4 divisors (see below), whose sum is σ = 333024. Its totient is φ = 249756.

The previous prime is 291377. The next prime is 291419. The reversal of 291389 is 983192.

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 291389 - 2⁴ = 291373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291349) 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, 20807 + ... + 20820.

It is an arithmetic number, because the mean of its divisors is an integer number (83256).

2²⁹¹³⁸⁹ is an apocalyptic number.

It is an amenable number.

291389 is a deficient number, since it is larger than the sum of its proper divisors (41635).

291389 is an equidigital number, since it uses as much as digits as its factorization.

291389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41634.

The product of its digits is 3888, while the sum is 32.

The square root of 291389 is about 539.8045942746. The cubic root of 291389 is about 66.2965686584.

The spelling of 291389 in words is "two hundred ninety-one thousand, three hundred eighty-nine".