220423549 has 2 divisors, whose sum is σ = 220423550. Its totient is φ = 220423548.

The previous prime is 220423543. The next prime is 220423571. The reversal of 220423549 is 945324022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220314649 + 108900 = 14843^2 + 330^2 .

It is a cyclic number.

It is not a de Polignac number, because 220423549 - 2⁵ = 220423517 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220423549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220423543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110211774 + 110211775.

It is an arithmetic number, because the mean of its divisors is an integer number (110211775).

Almost surely, 2^220423549 is an apocalyptic number.

It is an amenable number.

220423549 is a deficient number, since it is larger than the sum of its proper divisors (1).

220423549 is an equidigital number, since it uses as much as digits as its factorization.

220423549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 220423549 is about 14846.6679426732. The cubic root of 220423549 is about 604.0682321715.

The spelling of 220423549 in words is "two hundred twenty million, four hundred twenty-three thousand, five hundred forty-nine".