91340387 has 2 divisors, whose sum is σ = 91340388. Its totient is φ = 91340386.

The previous prime is 91340369. The next prime is 91340393. The reversal of 91340387 is 78304319.

It is a strong prime.

It is an emirp because it is prime and its reverse (78304319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91340387 - 2⁶ = 91340323 is a prime.

It is not a weakly prime, because it can be changed into another prime (91340287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45670193 + 45670194.

It is an arithmetic number, because the mean of its divisors is an integer number (45670194).

Almost surely, 2^91340387 is an apocalyptic number.

91340387 is a deficient number, since it is larger than the sum of its proper divisors (1).

91340387 is an equidigital number, since it uses as much as digits as its factorization.

91340387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 91340387 is about 9557.2164880785. The cubic root of 91340387 is about 450.3542675278.

The spelling of 91340387 in words is "ninety-one million, three hundred forty thousand, three hundred eighty-seven".