1223955559 has 4 divisors (see below), whose sum is σ = 1235394504. Its totient is φ = 1212516616.

The previous prime is 1223955541. The next prime is 1223955587. The reversal of 1223955559 is 9555593221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9555593221 = 19 ⋅502925959.

It is a cyclic number.

It is not a de Polignac number, because 1223955559 - 2²⁹ = 687084647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223955259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5719312 + ... + 5719525.

It is an arithmetic number, because the mean of its divisors is an integer number (308848626).

Almost surely, 2^1223955559 is an apocalyptic number.

1223955559 is a deficient number, since it is larger than the sum of its proper divisors (11438945).

1223955559 is a wasteful number, since it uses less digits than its factorization.

1223955559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11438944.

The product of its digits is 607500, while the sum is 46.

The square root of 1223955559 is about 34985.0762325881. The cubic root of 1223955559 is about 1069.6833019117.

The spelling of 1223955559 in words is "one billion, two hundred twenty-three million, nine hundred fifty-five thousand, five hundred fifty-nine".