180620161 has 6 divisors (see below), whose sum is σ = 181572162. Its totient is φ = 179673120.

The previous prime is 180620159. The next prime is 180620171. The reversal of 180620161 is 161026081.

It can be written as a sum of positive squares in only one way, i.e., 142563600 + 38056561 = 11940^2 + 6169^2 .

It is not a de Polignac number, because 180620161 - 2¹ = 180620159 is a prime.

It is the 13440-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (180620171) by changing a digit.

It is a nontrivial repunit in base 13439.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37321 + ... + 41881.

It is an arithmetic number, because the mean of its divisors is an integer number (30262027).

Almost surely, 2^180620161 is an apocalyptic number.

It is an amenable number.

180620161 is a deficient number, since it is larger than the sum of its proper divisors (952001).

180620161 is an frugal number, since it uses more digits than its factorization.

180620161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4959 (or 4760 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 180620161 is about 13439.5000279028. The cubic root of 180620161 is about 565.2693116602.

The spelling of 180620161 in words is "one hundred eighty million, six hundred twenty thousand, one hundred sixty-one".