220997311 has 4 divisors (see below), whose sum is σ = 221420392. Its totient is φ = 220574232.

The previous prime is 220997291. The next prime is 220997383. The reversal of 220997311 is 113799022.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 220997311 - 2¹¹ = 220995263 is a prime.

It is a super-2 number, since 2×220997311² = 97679622938461442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220997611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210756 + ... + 211801.

It is an arithmetic number, because the mean of its divisors is an integer number (55355098).

Almost surely, 2^220997311 is an apocalyptic number.

220997311 is a deficient number, since it is larger than the sum of its proper divisors (423081).

220997311 is an equidigital number, since it uses as much as digits as its factorization.

220997311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423080.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 220997311 is about 14865.9783061862. The cubic root of 220997311 is about 604.5919074733.

The spelling of 220997311 in words is "two hundred twenty million, nine hundred ninety-seven thousand, three hundred eleven".