1199986602721 has 3 divisors (see below), whose sum is σ = 1199987698161. Its totient is φ = 1199985507282.

The previous prime is 1199986602713. The next prime is 1199986602739. The reversal of 1199986602721 is 1272066899911.

The square root of 1199986602721 is 1095439.

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 1199986602721 - 2³ = 1199986602713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1199986602721.

It is not an unprimeable number, because it can be changed into a prime (1199986602751) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 547720 + ... + 1643158.

It is an arithmetic number, because the mean of its divisors is an integer number (399995899387).

Almost surely, 2^{1199986602721} is an apocalyptic number.

1199986602721 is the 1095439-th square number.

1199986602721 is the 547720-th centered octagonal number.

It is an amenable number.

1199986602721 is a deficient number, since it is larger than the sum of its proper divisors (1095440).

1199986602721 is an frugal number, since it uses more digits than its factorization.

1199986602721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2190878 (or 1095439 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 61.

The spelling of 1199986602721 in words is "one trillion, one hundred ninety-nine billion, nine hundred eighty-six million, six hundred two thousand, seven hundred twenty-one".