89111861 has 2 divisors, whose sum is σ = 89111862. Its totient is φ = 89111860.

The previous prime is 89111851. The next prime is 89111917. The reversal of 89111861 is 16811198.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88943761 + 168100 = 9431^2 + 410^2 .

It is a cyclic number.

It is not a de Polignac number, because 89111861 - 2⁶ = 89111797 is a prime.

It is a Sophie Germain prime.

It is a Chen 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 (89111851) 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, 44555930 + 44555931.

It is an arithmetic number, because the mean of its divisors is an integer number (44555931).

Almost surely, 2^89111861 is an apocalyptic number.

It is an amenable number.

89111861 is a deficient number, since it is larger than the sum of its proper divisors (1).

89111861 is an equidigital number, since it uses as much as digits as its factorization.

89111861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 35.

The square root of 89111861 is about 9439.9078914998. The cubic root of 89111861 is about 446.6614839997.

The spelling of 89111861 in words is "eighty-nine million, one hundred eleven thousand, eight hundred sixty-one".