1126287659521 has 4 divisors (see below), whose sum is σ = 1147538370132. Its totient is φ = 1105036948912.

The previous prime is 1126287659491. The next prime is 1126287659527. The reversal of 1126287659521 is 1259567826211.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 637819460496 + 488468199025 = 798636^2 + 698905^2 .

It is a cyclic number.

It is not a de Polignac number, because 1126287659521 - 2²⁹ = 1125750788609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1126287659527) 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 in 3 ways as a sum of consecutive naturals, for example, 10625355226 + ... + 10625355331.

It is an arithmetic number, because the mean of its divisors is an integer number (286884592533).

Almost surely, 2^{1126287659521} is an apocalyptic number.

It is an amenable number.

1126287659521 is a deficient number, since it is larger than the sum of its proper divisors (21250710611).

1126287659521 is an equidigital number, since it uses as much as digits as its factorization.

1126287659521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21250710610.

The product of its digits is 3628800, while the sum is 55.

The spelling of 1126287659521 in words is "one trillion, one hundred twenty-six billion, two hundred eighty-seven million, six hundred fifty-nine thousand, five hundred twenty-one".