1359979679521 has 4 divisors (see below), whose sum is σ = 1360760829844. Its totient is φ = 1359198529200.

The previous prime is 1359979679507. The next prime is 1359979679623. The reversal of 1359979679521 is 1259769799531.

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 201633329296 + 1158346350225 = 449036^2 + 1076265^2 .

It is a cyclic number.

It is not a de Polignac number, because 1359979679521 - 2⁵ = 1359979679489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1359979679021) 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, 390572550 + ... + 390576031.

It is an arithmetic number, because the mean of its divisors is an integer number (340190207461).

Almost surely, 2^{1359979679521} is an apocalyptic number.

It is an amenable number.

1359979679521 is a deficient number, since it is larger than the sum of its proper divisors (781150323).

1359979679521 is an equidigital number, since it uses as much as digits as its factorization.

1359979679521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781150322.

The product of its digits is 289340100, while the sum is 73.

The spelling of 1359979679521 in words is "one trillion, three hundred fifty-nine billion, nine hundred seventy-nine million, six hundred seventy-nine thousand, five hundred twenty-one".