291555 has 48 divisors (see below), whose sum is σ = 599040. Its totient is φ = 129600.

The previous prime is 291547. The next prime is 291559. The reversal of 291555 is 555192.

It is not a de Polignac number, because 291555 - 2³ = 291547 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (291559) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9390 + ... + 9420.

It is an arithmetic number, because the mean of its divisors is an integer number (12480).

2²⁹¹⁵⁵⁵ is an apocalyptic number.

291555 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

291555 is a wasteful number, since it uses less digits than its factorization.

291555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72 (or 69 counting only the distinct ones).

The product of its digits is 2250, while the sum is 27.

The square root of 291555 is about 539.9583317257. The cubic root of 291555 is about 66.3091556598.

The spelling of 291555 in words is "two hundred ninety-one thousand, five hundred fifty-five".