181000949 has 2 divisors, whose sum is σ = 181000950. Its totient is φ = 181000948.

The previous prime is 181000943. The next prime is 181000993. The reversal of 181000949 is 949000181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102111025 + 78889924 = 10105^2 + 8882^2 .

It is a cyclic number.

It is not a de Polignac number, because 181000949 - 2⁸ = 181000693 is a prime.

It is a super-2 number, since 2×181000949² = 65522687077801202, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181000943) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90500474 + 90500475.

It is an arithmetic number, because the mean of its divisors is an integer number (90500475).

Almost surely, 2^181000949 is an apocalyptic number.

It is an amenable number.

181000949 is a deficient number, since it is larger than the sum of its proper divisors (1).

181000949 is an equidigital number, since it uses as much as digits as its factorization.

181000949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 181000949 is about 13453.6593163347. The cubic root of 181000949 is about 565.6662711926. Note that the first 3 decimals are identical.

The spelling of 181000949 in words is "one hundred eighty-one million, nine hundred forty-nine", and thus it is an aban number.