181630073 has 2 divisors, whose sum is σ = 181630074. Its totient is φ = 181630072.

The previous prime is 181630069. The next prime is 181630087. The reversal of 181630073 is 370036181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181387024 + 243049 = 13468^2 + 493^2 .

It is a cyclic number.

It is not a de Polignac number, because 181630073 - 2² = 181630069 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (181630093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90815036 + 90815037.

It is an arithmetic number, because the mean of its divisors is an integer number (90815037).

Almost surely, 2^181630073 is an apocalyptic number.

It is an amenable number.

181630073 is a deficient number, since it is larger than the sum of its proper divisors (1).

181630073 is an equidigital number, since it uses as much as digits as its factorization.

181630073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 181630073 is about 13477.0201825181. The cubic root of 181630073 is about 566.3208952099.

The spelling of 181630073 in words is "one hundred eighty-one million, six hundred thirty thousand, seventy-three".