180521725 has 12 divisors (see below), whose sum is σ = 237014964. Its totient is φ = 135921920.

The previous prime is 180521713. The next prime is 180521743. The reversal of 180521725 is 527125081.

It can be written as a sum of positive squares in 6 ways, for example, as 4853209 + 175668516 = 2203^2 + 13254^2 .

It is not a de Polignac number, because 180521725 - 2²⁷ = 46303997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 211954 + ... + 212803.

It is an arithmetic number, because the mean of its divisors is an integer number (19751247).

Almost surely, 2^180521725 is an apocalyptic number.

It is an amenable number.

180521725 is a deficient number, since it is larger than the sum of its proper divisors (56493239).

180521725 is a wasteful number, since it uses less digits than its factorization.

180521725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424784 (or 424779 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 180521725 is about 13435.8373389975. The cubic root of 180521725 is about 565.1666044819.

The spelling of 180521725 in words is "one hundred eighty million, five hundred twenty-one thousand, seven hundred twenty-five".