220241309 has 2 divisors, whose sum is σ = 220241310. Its totient is φ = 220241308.

The previous prime is 220241303. The next prime is 220241311. The reversal of 220241309 is 903142022.

220241309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183602500 + 36638809 = 13550^2 + 6053^2 .

It is a cyclic number.

It is not a de Polignac number, because 220241309 - 2¹⁶ = 220175773 is a prime.

Together with 220241311, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_12135038 and since 220241309 and 12135038 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220241303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110120654 + 110120655.

It is an arithmetic number, because the mean of its divisors is an integer number (110120655).

Almost surely, 2^220241309 is an apocalyptic number.

It is an amenable number.

220241309 is a deficient number, since it is larger than the sum of its proper divisors (1).

220241309 is an equidigital number, since it uses as much as digits as its factorization.

220241309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 220241309 is about 14840.5292695375. The cubic root of 220241309 is about 603.9017107214.

The spelling of 220241309 in words is "two hundred twenty million, two hundred forty-one thousand, three hundred nine".