181712080729 has 27 divisors (see below), whose sum is σ = 192105714423. Its totient is φ = 171874886400.

The previous prime is 181712080723. The next prime is 181712080741. The reversal of 181712080729 is 927080217181.

The square root of 181712080729 is 426277.

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

It can be written as a sum of positive squares in 13 ways, for example, as 78061566025 + 103650514704 = 279395^2 + 321948^2 .

It is not a de Polignac number, because 181712080729 - 2²⁷ = 181577863001 is a prime.

It is a super-2 number, since 2×181712080729² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181712080723) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 646662069 + ... + 646662349.

Almost surely, 2^181712080729 is an apocalyptic number.

181712080729 is the 426277-th square number.

181712080729 is the 213139-th centered octagonal number.

It is an amenable number.

181712080729 is a deficient number, since it is larger than the sum of its proper divisors (10393633694).

181712080729 is an frugal number, since it uses more digits than its factorization.

181712080729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718 (or 359 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 46.

The spelling of 181712080729 in words is "one hundred eighty-one billion, seven hundred twelve million, eighty thousand, seven hundred twenty-nine".