291855 has 8 divisors (see below), whose sum is σ = 466992. Its totient is φ = 155648.

The previous prime is 291853. The next prime is 291857. The reversal of 291855 is 558192.

It is an interprime number because it is at equal distance from previous prime (291853) and next prime (291857).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 291855 - 2¹ = 291853 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 291855.

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 7 ways as a sum of consecutive naturals, for example, 9714 + ... + 9743.

It is an arithmetic number, because the mean of its divisors is an integer number (58374).

2²⁹¹⁸⁵⁵ is an apocalyptic number.

291855 is a deficient number, since it is larger than the sum of its proper divisors (175137).

291855 is a wasteful number, since it uses less digits than its factorization.

291855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19465.

The product of its digits is 3600, while the sum is 30.

The square root of 291855 is about 540.2360595147. The cubic root of 291855 is about 66.3318911386.

The spelling of 291855 in words is "two hundred ninety-one thousand, eight hundred fifty-five".