1228811689 has 8 divisors (see below), whose sum is σ = 1404579968. Its totient is φ = 1053099360.

The previous prime is 1228811687. The next prime is 1228811707. The reversal of 1228811689 is 9861188221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1228811689 - 2¹ = 1228811687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1228811687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57349 + ... + 75805.

It is an arithmetic number, because the mean of its divisors is an integer number (175572496).

Almost surely, 2^1228811689 is an apocalyptic number.

It is an amenable number.

1228811689 is a deficient number, since it is larger than the sum of its proper divisors (175768279).

1228811689 is an equidigital number, since it uses as much as digits as its factorization.

1228811689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27975.

The product of its digits is 110592, while the sum is 46.

The square root of 1228811689 is about 35054.4104072512. The cubic root of 1228811689 is about 1071.0961163888.

The spelling of 1228811689 in words is "one billion, two hundred twenty-eight million, eight hundred eleven thousand, six hundred eighty-nine".