1226309789 has 2 divisors, whose sum is σ = 1226309790. Its totient is φ = 1226309788.

The previous prime is 1226309771. The next prime is 1226309801. The reversal of 1226309789 is 9879036221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 730891225 + 495418564 = 27035^2 + 22258^2 .

It is an emirp because it is prime and its reverse (9879036221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1226309789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1226302789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613154894 + 613154895.

It is an arithmetic number, because the mean of its divisors is an integer number (613154895).

Almost surely, 2^1226309789 is an apocalyptic number.

It is an amenable number.

1226309789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1226309789 is an equidigital number, since it uses as much as digits as its factorization.

1226309789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 1226309789 is about 35018.7062725053. The cubic root of 1226309789 is about 1070.3686938010.

The spelling of 1226309789 in words is "one billion, two hundred twenty-six million, three hundred nine thousand, seven hundred eighty-nine".