1172713560561 has 9 divisors (see below), whose sum is σ = 1693924280139. Its totient is φ = 781806874536.

The previous prime is 1172713560539. The next prime is 1172713560637. The reversal of 1172713560561 is 1650653172711.

The square root of 1172713560561 is 1082919.

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

1172713560561 is a `hidden beast` number, since 1 + 1 + 7 + 2 + 7 + 1 + 35 + 605 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 50902128225 + 1121811432336 = 225615^2 + 1059156^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1172713560561 - 2²¹ = 1172711463409 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1172713560511) 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 8 ways as a sum of consecutive naturals, for example, 3068271 + ... + 3429243.

Almost surely, 2^{1172713560561} is an apocalyptic number.

1172713560561 is the 1082919-th square number.

1172713560561 is the 541460-th centered octagonal number.

It is an amenable number.

1172713560561 is a deficient number, since it is larger than the sum of its proper divisors (521210719578).

1172713560561 is an frugal number, since it uses more digits than its factorization.

1172713560561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721952 (or 360976 counting only the distinct ones).

The product of its (nonzero) digits is 264600, while the sum is 45.

The spelling of 1172713560561 in words is "one trillion, one hundred seventy-two billion, seven hundred thirteen million, five hundred sixty thousand, five hundred sixty-one".