181089473 has 2 divisors, whose sum is σ = 181089474. Its totient is φ = 181089472.

The previous prime is 181089443. The next prime is 181089479. The reversal of 181089473 is 374980181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119749249 + 61340224 = 10943^2 + 7832^2 .

It is a cyclic number.

It is not a de Polignac number, because 181089473 - 2⁸ = 181089217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 181089473.

It is not a weakly prime, because it can be changed into another prime (181089479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90544736 + 90544737.

It is an arithmetic number, because the mean of its divisors is an integer number (90544737).

Almost surely, 2^181089473 is an apocalyptic number.

It is an amenable number.

181089473 is a deficient number, since it is larger than the sum of its proper divisors (1).

181089473 is an equidigital number, since it uses as much as digits as its factorization.

181089473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 181089473 is about 13456.9488740948. The cubic root of 181089473 is about 565.7584749074.

The spelling of 181089473 in words is "one hundred eighty-one million, eighty-nine thousand, four hundred seventy-three".