180521245 has 4 divisors (see below), whose sum is σ = 216625500. Its totient is φ = 144416992.

The previous prime is 180521221. The next prime is 180521251. The reversal of 180521245 is 542125081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 542125081 = 19 ⋅28532899.

It can be written as a sum of positive squares in 2 ways, for example, as 90897156 + 89624089 = 9534^2 + 9467^2 .

It is a cyclic number.

It is not a de Polignac number, because 180521245 - 2⁹ = 180520733 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18052120 + ... + 18052129.

It is an arithmetic number, because the mean of its divisors is an integer number (54156375).

Almost surely, 2^180521245 is an apocalyptic number.

It is an amenable number.

180521245 is a deficient number, since it is larger than the sum of its proper divisors (36104255).

180521245 is an equidigital number, since it uses as much as digits as its factorization.

180521245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36104254.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 180521245 is about 13435.8194763103. The cubic root of 180521245 is about 565.1661035630.

The spelling of 180521245 in words is "one hundred eighty million, five hundred twenty-one thousand, two hundred forty-five".