291320 has 16 divisors (see below), whose sum is σ = 655560. Its totient is φ = 116512.

The previous prime is 291299. The next prime is 291331. The reversal of 291320 is 23192.

291320 is nontrivially palindromic in base 15.

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 291320.

It is an unprimeable number.

291320 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3602 + ... + 3681.

2²⁹¹³²⁰ is an apocalyptic number.

291320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

291320 is an abundant number, since it is smaller than the sum of its proper divisors (364240).

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

291320 is a wasteful number, since it uses less digits than its factorization.

291320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7294 (or 7290 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 291320 is about 539.7406784744. The cubic root of 291320 is about 66.2913353056.

The spelling of 291320 in words is "two hundred ninety-one thousand, three hundred twenty".