1172713726081 has 4 divisors (see below), whose sum is σ = 1194840400212. Its totient is φ = 1150587051952.

The previous prime is 1172713726049. The next prime is 1172713726097. The reversal of 1172713726081 is 1806273172711.

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 298535475456 + 874178250625 = 546384^2 + 934975^2 .

It is a cyclic number.

It is not a de Polignac number, because 1172713726081 - 2⁵ = 1172713726049 is a prime.

It is a super-2 number, since 2×1172713726081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1172713726381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11063336986 + ... + 11063337091.

It is an arithmetic number, because the mean of its divisors is an integer number (298710100053).

Almost surely, 2^{1172713726081} is an apocalyptic number.

It is an amenable number.

1172713726081 is a deficient number, since it is larger than the sum of its proper divisors (22126674131).

1172713726081 is an equidigital number, since it uses as much as digits as its factorization.

1172713726081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22126674130.

The product of its (nonzero) digits is 197568, while the sum is 46.

Adding to 1172713726081 its reverse (1806273172711), we get a palindrome (2978986898792).

The spelling of 1172713726081 in words is "one trillion, one hundred seventy-two billion, seven hundred thirteen million, seven hundred twenty-six thousand, eighty-one".