89818661 has 2 divisors, whose sum is σ = 89818662. Its totient is φ = 89818660.

The previous prime is 89818639. The next prime is 89818697. The reversal of 89818661 is 16681898.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88830625 + 988036 = 9425^2 + 994^2 .

It is a cyclic number.

It is not a de Polignac number, because 89818661 - 2¹⁴ = 89802277 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89818061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44909330 + 44909331.

It is an arithmetic number, because the mean of its divisors is an integer number (44909331).

Almost surely, 2^89818661 is an apocalyptic number.

It is an amenable number.

89818661 is a deficient number, since it is larger than the sum of its proper divisors (1).

89818661 is an equidigital number, since it uses as much as digits as its factorization.

89818661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 47.

The square root of 89818661 is about 9477.2707569215. The cubic root of 89818661 is about 447.8392895201.

The spelling of 89818661 in words is "eighty-nine million, eight hundred eighteen thousand, six hundred sixty-one".