91008143 has 2 divisors, whose sum is σ = 91008144. Its totient is φ = 91008142.

The previous prime is 91008139. The next prime is 91008173. The reversal of 91008143 is 34180019.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91008143 - 2² = 91008139 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91008103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45504071 + 45504072.

It is an arithmetic number, because the mean of its divisors is an integer number (45504072).

Almost surely, 2^91008143 is an apocalyptic number.

91008143 is a deficient number, since it is larger than the sum of its proper divisors (1).

91008143 is an equidigital number, since it uses as much as digits as its factorization.

91008143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 91008143 is about 9539.8188137931. The cubic root of 91008143 is about 449.8075605146.

The spelling of 91008143 in words is "ninety-one million, eight thousand, one hundred forty-three".