1280806002529 has 3 divisors (see below), whose sum is σ = 1280807134257. Its totient is φ = 1280804870802.

The previous prime is 1280806002481. The next prime is 1280806002551. The reversal of 1280806002529 is 9252006080821.

The square root of 1280806002529 is 1131727.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1280806002529 - 2²⁵ = 1280772448097 is a prime.

It is a super-2 number, since 2×1280806002529² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1280806002559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 565864 + ... + 1697590.

It is an arithmetic number, because the mean of its divisors is an integer number (426935711419).

Almost surely, 2^{1280806002529} is an apocalyptic number.

1280806002529 is the 1131727-th square number.

1280806002529 is the 565864-th centered octagonal number.

It is an amenable number.

1280806002529 is a deficient number, since it is larger than the sum of its proper divisors (1131728).

1280806002529 is an frugal number, since it uses more digits than its factorization.

1280806002529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2263454 (or 1131727 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 1280806002529 in words is "one trillion, two hundred eighty billion, eight hundred six million, two thousand, five hundred twenty-nine".