1239504681509 has 2 divisors, whose sum is σ = 1239504681510. Its totient is φ = 1239504681508.

The previous prime is 1239504681487. The next prime is 1239504681511. The reversal of 1239504681509 is 9051864059321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1190056264609 + 49448416900 = 1090897^2 + 222370^2 .

It is a cyclic number.

It is not a de Polignac number, because 1239504681509 - 2¹² = 1239504677413 is a prime.

Together with 1239504681511, 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 (1239504681599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619752340754 + 619752340755.

It is an arithmetic number, because the mean of its divisors is an integer number (619752340755).

Almost surely, 2^{1239504681509} is an apocalyptic number.

It is an amenable number.

1239504681509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1239504681509 is an equidigital number, since it uses as much as digits as its factorization.

1239504681509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2332800, while the sum is 53.

The spelling of 1239504681509 in words is "one trillion, two hundred thirty-nine billion, five hundred four million, six hundred eighty-one thousand, five hundred nine".