1186598454721 has 9 divisors (see below), whose sum is σ = 1188876208611. Its totient is φ = 1184325062664.

The previous prime is 1186598454719. The next prime is 1186598454763. The reversal of 1186598454721 is 1274548956811.

It is a happy number.

The square root of 1186598454721 is 1089311.

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

It can be written as a sum of positive squares in only one way, i.e., 554859622321 + 631738832400 = 744889^2 + 794820^2 .

It is not a de Polignac number, because 1186598454721 - 2¹ = 1186598454719 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 1186598454721.

It is not an unprimeable number, because it can be changed into a prime (1186598454781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1110007375 + ... + 1110008443.

Almost surely, 2^{1186598454721} is an apocalyptic number.

1186598454721 is the 1089311-st square number.

1186598454721 is the 544656-th centered octagonal number.

It is an amenable number.

1186598454721 is a deficient number, since it is larger than the sum of its proper divisors (2277753890).

1186598454721 is an frugal number, since it uses more digits than its factorization.

1186598454721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4176 (or 2088 counting only the distinct ones).

The product of its digits is 19353600, while the sum is 61.

The spelling of 1186598454721 in words is "one trillion, one hundred eighty-six billion, five hundred ninety-eight million, four hundred fifty-four thousand, seven hundred twenty-one".