1229027809 has 2 divisors, whose sum is σ = 1229027810. Its totient is φ = 1229027808.

The previous prime is 1229027803. The next prime is 1229027819. The reversal of 1229027809 is 9087209221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1177862400 + 51165409 = 34320^2 + 7153^2 .

It is a cyclic number.

It is not a de Polignac number, because 1229027809 - 2¹⁷ = 1228896737 is a prime.

It is not a weakly prime, because it can be changed into another prime (1229027803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614513904 + 614513905.

It is an arithmetic number, because the mean of its divisors is an integer number (614513905).

Almost surely, 2^1229027809 is an apocalyptic number.

It is an amenable number.

1229027809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1229027809 is an equidigital number, since it uses as much as digits as its factorization.

1229027809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 1229027809 is about 35057.4929080789. The cubic root of 1229027809 is about 1071.1589065150.

The spelling of 1229027809 in words is "one billion, two hundred twenty-nine million, twenty-seven thousand, eight hundred nine".