180788121 has 6 divisors (see below), whose sum is σ = 261138410. Its totient is φ = 120525408.

The previous prime is 180788099. The next prime is 180788123. The reversal of 180788121 is 121887081.

It can be written as a sum of positive squares in only one way, i.e., 176225625 + 4562496 = 13275^2 + 2136^2 .

It is not a de Polignac number, because 180788121 - 2⁵ = 180788089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (180788123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10043776 + ... + 10043793.

Almost surely, 2^180788121 is an apocalyptic number.

It is an amenable number.

180788121 is a deficient number, since it is larger than the sum of its proper divisors (80350289).

180788121 is a wasteful number, since it uses less digits than its factorization.

180788121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20087575 (or 20087572 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 36.

The square root of 180788121 is about 13445.7473202496. The cubic root of 180788121 is about 565.4444733900. Note that the first 4 decimals are identical.

The spelling of 180788121 in words is "one hundred eighty million, seven hundred eighty-eight thousand, one hundred twenty-one".