1180397504521 has 3 divisors (see below), whose sum is σ = 1180398590983. Its totient is φ = 1180396418060.

The previous prime is 1180397504497. The next prime is 1180397504549. The reversal of 1180397504521 is 1254057930811.

The square root of 1180397504521 is 1086461.

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 can be written as a sum of positive squares in only one way, i.e., 602158928121 + 578238576400 = 775989^2 + 760420^2 .

It is not a de Polignac number, because 1180397504521 - 2¹⁵ = 1180397471753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1180397504021) 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, 543231 + ... + 1629691.

Almost surely, 2^{1180397504521} is an apocalyptic number.

1180397504521 is the 1086461-st square number.

1180397504521 is the 543231-st centered octagonal number.

It is an amenable number.

1180397504521 is a deficient number, since it is larger than the sum of its proper divisors (1086462).

1180397504521 is an frugal number, since it uses more digits than its factorization.

1180397504521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2172922 (or 1086461 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 46.

It can be divided in two parts, 118039 and 7504521, that added together give a triangular number (7622560 = T₃₉₀₄).

The spelling of 1180397504521 in words is "one trillion, one hundred eighty billion, three hundred ninety-seven million, five hundred four thousand, five hundred twenty-one".