12281527809 has 6 divisors (see below), whose sum is σ = 17739984626. Its totient is φ = 8187685200.

The previous prime is 12281527801. The next prime is 12281527837. The reversal of 12281527809 is 90872518221.

It can be written as a sum of positive squares in only one way, i.e., 7885440000 + 4396087809 = 88800^2 + 66303^2 .

It is not a de Polignac number, because 12281527809 - 2³ = 12281527801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12281527801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 682307092 + ... + 682307109.

Almost surely, 2^12281527809 is an apocalyptic number.

It is an amenable number.

12281527809 is a deficient number, since it is larger than the sum of its proper divisors (5458456817).

12281527809 is a wasteful number, since it uses less digits than its factorization.

12281527809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364614207 (or 1364614204 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 12281527809 in words is "twelve billion, two hundred eighty-one million, five hundred twenty-seven thousand, eight hundred nine".