1225233509 has 2 divisors, whose sum is σ = 1225233510. Its totient is φ = 1225233508.

The previous prime is 1225233497. The next prime is 1225233511. The reversal of 1225233509 is 9053325221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 744089284 + 481144225 = 27278^2 + 21935^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225233509 - 2¹⁶ = 1225167973 is a prime.

Together with 1225233511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225233539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612616754 + 612616755.

It is an arithmetic number, because the mean of its divisors is an integer number (612616755).

Almost surely, 2^1225233509 is an apocalyptic number.

It is an amenable number.

1225233509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225233509 is an equidigital number, since it uses as much as digits as its factorization.

1225233509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 1225233509 is about 35003.3356839030. The cubic root of 1225233509 is about 1070.0554631046.

The spelling of 1225233509 in words is "one billion, two hundred twenty-five million, two hundred thirty-three thousand, five hundred nine".