1228518079 has 4 divisors (see below), whose sum is σ = 1229126184. Its totient is φ = 1227909976.

The previous prime is 1228518061. The next prime is 1228518103. The reversal of 1228518079 is 9708158221.

It is a happy number.

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 1228518079 - 2⁵ = 1228518047 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 (1228518059) 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, 301012 + ... + 305065.

It is an arithmetic number, because the mean of its divisors is an integer number (307281546).

Almost surely, 2^1228518079 is an apocalyptic number.

1228518079 is a deficient number, since it is larger than the sum of its proper divisors (608105).

1228518079 is an equidigital number, since it uses as much as digits as its factorization.

1228518079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608104.

The product of its (nonzero) digits is 80640, while the sum is 43.

The square root of 1228518079 is about 35050.2222389531. Note that the first 4 decimals coincide. The cubic root of 1228518079 is about 1071.0108010162.

The spelling of 1228518079 in words is "one billion, two hundred twenty-eight million, five hundred eighteen thousand, seventy-nine".