220997 has 8 divisors (see below), whose sum is σ = 255552. Its totient is φ = 187200.

The previous prime is 220973. The next prime is 221021. The reversal of 220997 is 799022.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (220973) and next prime (221021).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 220997 - 2⁶ = 220933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220907) 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 7 ways as a sum of consecutive naturals, for example, 797 + ... + 1037.

It is an arithmetic number, because the mean of its divisors is an integer number (31944).

2²²⁰⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

220997 is a deficient number, since it is larger than the sum of its proper divisors (34555).

220997 is a wasteful number, since it uses less digits than its factorization.

220997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 220997 is about 470.1031801637. The cubic root of 220997 is about 60.4591623868.

The spelling of 220997 in words is "two hundred twenty thousand, nine hundred ninety-seven".