1233128249 has 2 divisors, whose sum is σ = 1233128250. Its totient is φ = 1233128248.

The previous prime is 1233128231. The next prime is 1233128251. The reversal of 1233128249 is 9428213321.

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., 967210000 + 265918249 = 31100^2 + 16307^2 .

It is an emirp because it is prime and its reverse (9428213321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1233128249 - 2²⁴ = 1216351033 is a prime.

Together with 1233128251, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1233121249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 616564124 + 616564125.

It is an arithmetic number, because the mean of its divisors is an integer number (616564125).

Almost surely, 2^1233128249 is an apocalyptic number.

It is an amenable number.

1233128249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1233128249 is an equidigital number, since it uses as much as digits as its factorization.

1233128249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 35.

The square root of 1233128249 is about 35115.9258599286. The cubic root of 1233128249 is about 1072.3488300182.

The spelling of 1233128249 in words is "one billion, two hundred thirty-three million, one hundred twenty-eight thousand, two hundred forty-nine".