89719891 has 2 divisors, whose sum is σ = 89719892. Its totient is φ = 89719890.

The previous prime is 89719871. The next prime is 89719951. The reversal of 89719891 is 19891798.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 89719891 - 2⁹ = 89719379 is a prime.

It is not a weakly prime, because it can be changed into another prime (89719811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44859945 + 44859946.

It is an arithmetic number, because the mean of its divisors is an integer number (44859946).

Almost surely, 2^89719891 is an apocalyptic number.

89719891 is a deficient number, since it is larger than the sum of its proper divisors (1).

89719891 is an equidigital number, since it uses as much as digits as its factorization.

89719891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 52.

The square root of 89719891 is about 9472.0584352083. The cubic root of 89719891 is about 447.6750723079.

The spelling of 89719891 in words is "eighty-nine million, seven hundred nineteen thousand, eight hundred ninety-one".