1228492789 has 2 divisors, whose sum is σ = 1228492790. Its totient is φ = 1228492788.

The previous prime is 1228492781. The next prime is 1228492801. The reversal of 1228492789 is 9872948221.

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., 1193149764 + 35343025 = 34542^2 + 5945^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228492789 - 2³ = 1228492781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1228492781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614246394 + 614246395.

It is an arithmetic number, because the mean of its divisors is an integer number (614246395).

Almost surely, 2^1228492789 is an apocalyptic number.

It is an amenable number.

1228492789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228492789 is an equidigital number, since it uses as much as digits as its factorization.

1228492789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 52.

The square root of 1228492789 is about 35049.8614690558. The cubic root of 1228492789 is about 1071.0034517690.

The spelling of 1228492789 in words is "one billion, two hundred twenty-eight million, four hundred ninety-two thousand, seven hundred eighty-nine".