180500521 has 2 divisors, whose sum is σ = 180500522. Its totient is φ = 180500520.

The previous prime is 180500519. The next prime is 180500561. The reversal of 180500521 is 125005081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180499225 + 1296 = 13435^2 + 36^2 .

It is an emirp because it is prime and its reverse (125005081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 180500521 - 2¹ = 180500519 is a prime.

Together with 180500519, it forms a pair of twin primes.

It is equal to p_10056640 and since 180500521 and 10056640 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 180500492 and 180500501.

It is not a weakly prime, because it can be changed into another prime (180500501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90250260 + 90250261.

It is an arithmetic number, because the mean of its divisors is an integer number (90250261).

Almost surely, 2^180500521 is an apocalyptic number.

It is an amenable number.

180500521 is a deficient number, since it is larger than the sum of its proper divisors (1).

180500521 is an equidigital number, since it uses as much as digits as its factorization.

180500521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 180500521 is about 13435.0482321427. The cubic root of 180500521 is about 565.1444755444.

The spelling of 180500521 in words is "one hundred eighty million, five hundred thousand, five hundred twenty-one".