181882681 has 2 divisors, whose sum is σ = 181882682. Its totient is φ = 181882680.

The previous prime is 181882651. The next prime is 181882691. The reversal of 181882681 is 186288181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166797225 + 15085456 = 12915^2 + 3884^2 .

It is a cyclic number.

It is not a de Polignac number, because 181882681 - 2⁷ = 181882553 is a prime.

It is a super-2 number, since 2×181882681² = 66162619295495522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (181882651) 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, 90941340 + 90941341.

It is an arithmetic number, because the mean of its divisors is an integer number (90941341).

Almost surely, 2^181882681 is an apocalyptic number.

It is an amenable number.

181882681 is a deficient number, since it is larger than the sum of its proper divisors (1).

181882681 is an equidigital number, since it uses as much as digits as its factorization.

181882681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49152, while the sum is 43.

The square root of 181882681 is about 13486.3887308649. The cubic root of 181882681 is about 566.5833167297.

The spelling of 181882681 in words is "one hundred eighty-one million, eight hundred eighty-two thousand, six hundred eighty-one".