91033889 has 2 divisors, whose sum is σ = 91033890. Its totient is φ = 91033888.

The previous prime is 91033853. The next prime is 91033907. The reversal of 91033889 is 98833019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51595489 + 39438400 = 7183^2 + 6280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91033889 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (91033849) 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, 45516944 + 45516945.

It is an arithmetic number, because the mean of its divisors is an integer number (45516945).

Almost surely, 2^91033889 is an apocalyptic number.

It is an amenable number.

91033889 is a deficient number, since it is larger than the sum of its proper divisors (1).

91033889 is an equidigital number, since it uses as much as digits as its factorization.

91033889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 91033889 is about 9541.1681150685. The cubic root of 91033889 is about 449.8499730328.

The spelling of 91033889 in words is "ninety-one million, thirty-three thousand, eight hundred eighty-nine".