1228501289 has 8 divisors (see below), whose sum is σ = 1235325000. Its totient is φ = 1221697152.

The previous prime is 1228501273. The next prime is 1228501303. The reversal of 1228501289 is 9821058221.

It can be written as a sum of positive squares in 4 ways, for example, as 342546064 + 885955225 = 18508^2 + 29765^2 .

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 1228501289 - 2⁴ = 1228501273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1228507289) 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, 131237 + ... + 140285.

It is an arithmetic number, because the mean of its divisors is an integer number (154415625).

Almost surely, 2^1228501289 is an apocalyptic number.

It is an amenable number.

1228501289 is a deficient number, since it is larger than the sum of its proper divisors (6823711).

1228501289 is an equidigital number, since it uses as much as digits as its factorization.

1228501289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9787.

The product of its (nonzero) digits is 23040, while the sum is 38.

The square root of 1228501289 is about 35049.9827246748. The cubic root of 1228501289 is about 1071.0059218712.

The spelling of 1228501289 in words is "one billion, two hundred twenty-eight million, five hundred one thousand, two hundred eighty-nine".