220313231 has 2 divisors, whose sum is σ = 220313232. Its totient is φ = 220313230.

The previous prime is 220313201. The next prime is 220313243. The reversal of 220313231 is 132313022.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220313231 is a prime.

It is a super-2 number, since 2×220313231² = 97075839507318722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220313201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110156615 + 110156616.

It is an arithmetic number, because the mean of its divisors is an integer number (110156616).

Almost surely, 2^220313231 is an apocalyptic number.

220313231 is a deficient number, since it is larger than the sum of its proper divisors (1).

220313231 is an equidigital number, since it uses as much as digits as its factorization.

220313231 is an odious number, because the sum of its binary digits is odd.

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

The square root of 220313231 is about 14842.9522332991. The cubic root of 220313231 is about 603.9674402795.

Adding to 220313231 its reverse (132313022), we get a palindrome (352626253).

The spelling of 220313231 in words is "two hundred twenty million, three hundred thirteen thousand, two hundred thirty-one".