220331231 has 2 divisors, whose sum is σ = 220331232. Its totient is φ = 220331230.

The previous prime is 220331227. The next prime is 220331233. The reversal of 220331231 is 132133022.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 220331231 - 2² = 220331227 is a prime.

It is a super-2 number, since 2×220331231² = 97091702707950722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 220331233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220331233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110165615 + 110165616.

It is an arithmetic number, because the mean of its divisors is an integer number (110165616).

Almost surely, 2^220331231 is an apocalyptic number.

220331231 is a deficient number, since it is larger than the sum of its proper divisors (1).

220331231 is an equidigital number, since it uses as much as digits as its factorization.

220331231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 220331231 is about 14843.5585692919. The cubic root of 220331231 is about 603.9838882520.

Adding to 220331231 its reverse (132133022), we get a palindrome (352464253).

The spelling of 220331231 in words is "two hundred twenty million, three hundred thirty-one thousand, two hundred thirty-one".