180545021 has 2 divisors, whose sum is σ = 180545022. Its totient is φ = 180545020.

The previous prime is 180544997. The next prime is 180545069. The reversal of 180545021 is 120545081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180499225 + 45796 = 13435^2 + 214^2 .

It is a cyclic number.

It is not a de Polignac number, because 180545021 - 2⁶ = 180544957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (180545081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90272510 + 90272511.

It is an arithmetic number, because the mean of its divisors is an integer number (90272511).

Almost surely, 2^180545021 is an apocalyptic number.

It is an amenable number.

180545021 is a deficient number, since it is larger than the sum of its proper divisors (1).

180545021 is an equidigital number, since it uses as much as digits as its factorization.

180545021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 180545021 is about 13436.7042462056. The cubic root of 180545021 is about 565.1909146767.

The spelling of 180545021 in words is "one hundred eighty million, five hundred forty-five thousand, twenty-one".