181000663 has 2 divisors, whose sum is σ = 181000664. Its totient is φ = 181000662.

The previous prime is 181000627. The next prime is 181000667. The reversal of 181000663 is 366000181.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181000663 is a prime.

It is a super-2 number, since 2×181000663² = 65522480012879138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181000667) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90500331 + 90500332.

It is an arithmetic number, because the mean of its divisors is an integer number (90500332).

Almost surely, 2^181000663 is an apocalyptic number.

181000663 is a deficient number, since it is larger than the sum of its proper divisors (1).

181000663 is an equidigital number, since it uses as much as digits as its factorization.

181000663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 181000663 is about 13453.6486872521. The cubic root of 181000663 is about 565.6659732556.

The spelling of 181000663 in words is "one hundred eighty-one million, six hundred sixty-three", and thus it is an aban number.