220857911 has 2 divisors, whose sum is σ = 220857912. Its totient is φ = 220857910.

The previous prime is 220857893. The next prime is 220857977. The reversal of 220857911 is 119758022.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 220857911 - 2¹⁰ = 220856887 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220854911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110428955 + 110428956.

It is an arithmetic number, because the mean of its divisors is an integer number (110428956).

Almost surely, 2^220857911 is an apocalyptic number.

220857911 is a deficient number, since it is larger than the sum of its proper divisors (1).

220857911 is an equidigital number, since it uses as much as digits as its factorization.

220857911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 220857911 is about 14861.2890086964. The cubic root of 220857911 is about 604.4647598648.

The spelling of 220857911 in words is "two hundred twenty million, eight hundred fifty-seven thousand, nine hundred eleven".