1226559823 has 4 divisors (see below), whose sum is σ = 1230746328. Its totient is φ = 1222373320.

The previous prime is 1226559811. The next prime is 1226559827. The reversal of 1226559823 is 3289556221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1226559823 - 2⁹ = 1226559311 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1226559823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1226559827) 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, 2092813 + ... + 2093398.

It is an arithmetic number, because the mean of its divisors is an integer number (307686582).

Almost surely, 2^1226559823 is an apocalyptic number.

1226559823 is a deficient number, since it is larger than the sum of its proper divisors (4186505).

1226559823 is an equidigital number, since it uses as much as digits as its factorization.

1226559823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4186504.

The product of its digits is 259200, while the sum is 43.

The square root of 1226559823 is about 35022.2760967930. The cubic root of 1226559823 is about 1070.4414351755.

The spelling of 1226559823 in words is "one billion, two hundred twenty-six million, five hundred fifty-nine thousand, eight hundred twenty-three".