89640181 has 2 divisors, whose sum is σ = 89640182. Its totient is φ = 89640180.

The previous prime is 89640169. The next prime is 89640211. The reversal of 89640181 is 18104698.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87721956 + 1918225 = 9366^2 + 1385^2 .

It is a cyclic number.

It is not a de Polignac number, because 89640181 - 2⁵ = 89640149 is a prime.

It is a super-2 number, since 2×89640181² = 16070724099425522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 89640181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89640151) 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, 44820090 + 44820091.

It is an arithmetic number, because the mean of its divisors is an integer number (44820091).

Almost surely, 2^89640181 is an apocalyptic number.

It is an amenable number.

89640181 is a deficient number, since it is larger than the sum of its proper divisors (1).

89640181 is an equidigital number, since it uses as much as digits as its factorization.

89640181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 89640181 is about 9467.8498615050. The cubic root of 89640181 is about 447.5424567772.

The spelling of 89640181 in words is "eighty-nine million, six hundred forty thousand, one hundred eighty-one".