181463521 has 2 divisors, whose sum is σ = 181463522. Its totient is φ = 181463520.

The previous prime is 181463519. The next prime is 181463549. The reversal of 181463521 is 125364181.

181463521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180633600 + 829921 = 13440^2 + 911^2 .

It is a cyclic number.

It is not a de Polignac number, because 181463521 - 2¹ = 181463519 is a prime.

Together with 181463519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (181463501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90731760 + 90731761.

It is an arithmetic number, because the mean of its divisors is an integer number (90731761).

Almost surely, 2^181463521 is an apocalyptic number.

It is an amenable number.

181463521 is a deficient number, since it is larger than the sum of its proper divisors (1).

181463521 is an equidigital number, since it uses as much as digits as its factorization.

181463521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 31.

The square root of 181463521 is about 13470.8396546021. The cubic root of 181463521 is about 566.1477397380.

The spelling of 181463521 in words is "one hundred eighty-one million, four hundred sixty-three thousand, five hundred twenty-one".