1225129439 has 2 divisors, whose sum is σ = 1225129440. Its totient is φ = 1225129438.

The previous prime is 1225129427. The next prime is 1225129441. The reversal of 1225129439 is 9349215221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1225129439 is a prime.

Together with 1225129441, 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 (1225126439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612564719 + 612564720.

It is an arithmetic number, because the mean of its divisors is an integer number (612564720).

Almost surely, 2^1225129439 is an apocalyptic number.

1225129439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225129439 is an equidigital number, since it uses as much as digits as its factorization.

1225129439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 38.

The square root of 1225129439 is about 35001.8490797272. The cubic root of 1225129439 is about 1070.0251657982.

The spelling of 1225129439 in words is "one billion, two hundred twenty-five million, one hundred twenty-nine thousand, four hundred thirty-nine".