1228535909 has 2 divisors, whose sum is σ = 1228535910. Its totient is φ = 1228535908.

The previous prime is 1228535881. The next prime is 1228535927. The reversal of 1228535909 is 9095358221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 848090884 + 380445025 = 29122^2 + 19505^2 .

It is an emirp because it is prime and its reverse (9095358221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1228535909 - 2²⁰ = 1227487333 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1228535909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1228535939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614267954 + 614267955.

It is an arithmetic number, because the mean of its divisors is an integer number (614267955).

Almost surely, 2^1228535909 is an apocalyptic number.

It is an amenable number.

1228535909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228535909 is an equidigital number, since it uses as much as digits as its factorization.

1228535909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 1228535909 is about 35050.4765873447. The cubic root of 1228535909 is about 1071.0159823346.

The spelling of 1228535909 in words is "one billion, two hundred twenty-eight million, five hundred thirty-five thousand, nine hundred nine".