91038287 has 2 divisors, whose sum is σ = 91038288. Its totient is φ = 91038286.

The previous prime is 91038251. The next prime is 91038307. The reversal of 91038287 is 78283019.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91038287 - 2⁶ = 91038223 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91038287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91038487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45519143 + 45519144.

It is an arithmetic number, because the mean of its divisors is an integer number (45519144).

Almost surely, 2^91038287 is an apocalyptic number.

91038287 is a deficient number, since it is larger than the sum of its proper divisors (1).

91038287 is an equidigital number, since it uses as much as digits as its factorization.

91038287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 91038287 is about 9541.3985872093. The cubic root of 91038287 is about 449.8572172520.

The spelling of 91038287 in words is "ninety-one million, thirty-eight thousand, two hundred eighty-seven".