15239798809 has 2 divisors, whose sum is σ = 15239798810. Its totient is φ = 15239798808.

The previous prime is 15239798773. The next prime is 15239798813. The reversal of 15239798809 is 90889793251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14923065600 + 316733209 = 122160^2 + 17797^2 .

It is a cyclic number.

It is not a de Polignac number, because 15239798809 - 2⁷ = 15239798681 is a prime.

It is not a weakly prime, because it can be changed into another prime (15239798009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7619899404 + 7619899405.

It is an arithmetic number, because the mean of its divisors is an integer number (7619899405).

Almost surely, 2^15239798809 is an apocalyptic number.

It is an amenable number.

15239798809 is a deficient number, since it is larger than the sum of its proper divisors (1).

15239798809 is an equidigital number, since it uses as much as digits as its factorization.

15239798809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9797760, while the sum is 61.

The spelling of 15239798809 in words is "fifteen billion, two hundred thirty-nine million, seven hundred ninety-eight thousand, eight hundred nine".