23220289 has 2 divisors, whose sum is σ = 23220290. Its totient is φ = 23220288.

The previous prime is 23220287. The next prime is 23220313. The reversal of 23220289 is 98202232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17363889 + 5856400 = 4167^2 + 2420^2 .

It is a cyclic number.

It is not a de Polignac number, because 23220289 - 2¹ = 23220287 is a prime.

Together with 23220287, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23220287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11610144 + 11610145.

It is an arithmetic number, because the mean of its divisors is an integer number (11610145).

Almost surely, 2^23220289 is an apocalyptic number.

It is an amenable number.

23220289 is a deficient number, since it is larger than the sum of its proper divisors (1).

23220289 is an equidigital number, since it uses as much as digits as its factorization.

23220289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 23220289 is about 4818.7435084262. The cubic root of 23220289 is about 285.2917459782.

The spelling of 23220289 in words is "twenty-three million, two hundred twenty thousand, two hundred eighty-nine".