1223109989 has 2 divisors, whose sum is σ = 1223109990. Its totient is φ = 1223109988.

The previous prime is 1223109977. The next prime is 1223110087. The reversal of 1223109989 is 9899013221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1026689764 + 196420225 = 32042^2 + 14015^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223109989 - 2⁴ = 1223109973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223109689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611554994 + 611554995.

It is an arithmetic number, because the mean of its divisors is an integer number (611554995).

Almost surely, 2^1223109989 is an apocalyptic number.

It is an amenable number.

1223109989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223109989 is an equidigital number, since it uses as much as digits as its factorization.

1223109989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 1223109989 is about 34972.9894204084. The cubic root of 1223109989 is about 1069.4369148398.

The spelling of 1223109989 in words is "one billion, two hundred twenty-three million, one hundred nine thousand, nine hundred eighty-nine".