180640521 has 12 divisors (see below), whose sum is σ = 276273972. Its totient is φ = 113342976.

The previous prime is 180640519. The next prime is 180640561. The reversal of 180640521 is 125046081.

180640521 is a `hidden beast` number, since 1 + 80 + 64 + 0 + 521 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 75064896 + 105575625 = 8664^2 + 10275^2 .

It is not a de Polignac number, because 180640521 - 2¹ = 180640519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (180640501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 590176 + ... + 590481.

It is an arithmetic number, because the mean of its divisors is an integer number (23022831).

Almost surely, 2^180640521 is an apocalyptic number.

It is an amenable number.

180640521 is a deficient number, since it is larger than the sum of its proper divisors (95633451).

180640521 is a wasteful number, since it uses less digits than its factorization.

180640521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180680 (or 1180677 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 180640521 is about 13440.2574752123. The cubic root of 180640521 is about 565.2905504313.

The spelling of 180640521 in words is "one hundred eighty million, six hundred forty thousand, five hundred twenty-one".