291222 has 16 divisors (see below), whose sum is σ = 647280. Its totient is φ = 97056.

The previous prime is 291217. The next prime is 291253. The reversal of 291222 is 222192.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 291195 and 291204.

It is a congruent number.

It is an unprimeable number.

291222 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 7 ways as a sum of consecutive naturals, for example, 2643 + ... + 2750.

It is an arithmetic number, because the mean of its divisors is an integer number (40455).

2²⁹¹²²² is an apocalyptic number.

291222 is an abundant number, since it is smaller than the sum of its proper divisors (356058).

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

291222 is a wasteful number, since it uses less digits than its factorization.

291222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5404 (or 5398 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 291222 is about 539.6498865005. The cubic root of 291222 is about 66.2839010071.

The spelling of 291222 in words is "two hundred ninety-one thousand, two hundred twenty-two".