180109729 has 4 divisors (see below), whose sum is σ = 180246784. Its totient is φ = 179972676.

The previous prime is 180109717. The next prime is 180109733. The reversal of 180109729 is 927901081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 180109729 - 2²⁷ = 45892001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (180109739) 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, 66537 + ... + 69190.

It is an arithmetic number, because the mean of its divisors is an integer number (45061696).

Almost surely, 2^180109729 is an apocalyptic number.

It is an amenable number.

180109729 is a deficient number, since it is larger than the sum of its proper divisors (137055).

180109729 is a wasteful number, since it uses less digits than its factorization.

180109729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137054.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 180109729 is about 13420.4966003498. The cubic root of 180109729 is about 564.7363261810.

The spelling of 180109729 in words is "one hundred eighty million, one hundred nine thousand, seven hundred twenty-nine".