180421481 has 2 divisors, whose sum is σ = 180421482. Its totient is φ = 180421480.

The previous prime is 180421463. The next prime is 180421513. The reversal of 180421481 is 184124081.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161061481 + 19360000 = 12691^2 + 4400^2 .

It is an emirp because it is prime and its reverse (184124081) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-180421481 is a prime.

It is a super-2 number, since 2×180421481² = 65103821612466722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (180421411) 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, 90210740 + 90210741.

It is an arithmetic number, because the mean of its divisors is an integer number (90210741).

Almost surely, 2^180421481 is an apocalyptic number.

It is an amenable number.

180421481 is a deficient number, since it is larger than the sum of its proper divisors (1).

180421481 is an equidigital number, since it uses as much as digits as its factorization.

180421481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2048, while the sum is 29.

The square root of 180421481 is about 13432.1063500852. The cubic root of 180421481 is about 565.0619724750.

The spelling of 180421481 in words is "one hundred eighty million, four hundred twenty-one thousand, four hundred eighty-one".