291591 has 12 divisors (see below), whose sum is σ = 425880. Its totient is φ = 192240.

The previous prime is 291569. The next prime is 291619. The reversal of 291591 is 195192.

It is a happy number.

It is not a de Polignac number, because 291591 - 2⁵ = 291559 is a prime.

It is a super-2 number, since 2×291591² = 170050622562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1521 + ... + 1701.

It is an arithmetic number, because the mean of its divisors is an integer number (35490).

2²⁹¹⁵⁹¹ is an apocalyptic number.

291591 is a deficient number, since it is larger than the sum of its proper divisors (134289).

291591 is a wasteful number, since it uses less digits than its factorization.

291591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366 (or 363 counting only the distinct ones).

The product of its digits is 810, while the sum is 27.

The square root of 291591 is about 539.9916666024. The cubic root of 291591 is about 66.3118847405.

The spelling of 291591 in words is "two hundred ninety-one thousand, five hundred ninety-one".