290221 has 4 divisors (see below), whose sum is σ = 295200. Its totient is φ = 285244.

The previous prime is 290219. The next prime is 290233. The reversal of 290221 is 122092.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 290221 - 2¹ = 290219 is a prime.

It is a super-3 number, since 3×290221³ = 73334402407391583, which contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 290195 and 290204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (290201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2401 + ... + 2518.

It is an arithmetic number, because the mean of its divisors is an integer number (73800).

2²⁹⁰²²¹ is an apocalyptic number.

It is an amenable number.

290221 is a deficient number, since it is larger than the sum of its proper divisors (4979).

290221 is an equidigital number, since it uses as much as digits as its factorization.

290221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4978.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 290221 is about 538.7216349842. The cubic root of 290221 is about 66.2078692617.

The spelling of 290221 in words is "two hundred ninety thousand, two hundred twenty-one".