91910387 has 2 divisors, whose sum is σ = 91910388. Its totient is φ = 91910386.

The previous prime is 91910341. The next prime is 91910407. The reversal of 91910387 is 78301919.

It is a strong prime.

It is an emirp because it is prime and its reverse (78301919) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91910387 - 2²⁰ = 90861811 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 91910387.

It is not a weakly prime, because it can be changed into another prime (91910317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45955193 + 45955194.

It is an arithmetic number, because the mean of its divisors is an integer number (45955194).

Almost surely, 2^91910387 is an apocalyptic number.

91910387 is a deficient number, since it is larger than the sum of its proper divisors (1).

91910387 is an equidigital number, since it uses as much as digits as its factorization.

91910387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 91910387 is about 9586.9905079749. The cubic root of 91910387 is about 451.2891216149.

The spelling of 91910387 in words is "ninety-one million, nine hundred ten thousand, three hundred eighty-seven".