91089143 has 2 divisors, whose sum is σ = 91089144. Its totient is φ = 91089142.

The previous prime is 91089137. The next prime is 91089169. The reversal of 91089143 is 34198019.

It is a weak prime.

It is an emirp because it is prime and its reverse (34198019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91089143 - 2⁸ = 91088887 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91089443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45544571 + 45544572.

It is an arithmetic number, because the mean of its divisors is an integer number (45544572).

Almost surely, 2^91089143 is an apocalyptic number.

91089143 is a deficient number, since it is larger than the sum of its proper divisors (1).

91089143 is an equidigital number, since it uses as much as digits as its factorization.

91089143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 91089143 is about 9544.0632332356. The cubic root of 91089143 is about 449.9409683882.

The spelling of 91089143 in words is "ninety-one million, eighty-nine thousand, one hundred forty-three".