91340489 has 2 divisors, whose sum is σ = 91340490. Its totient is φ = 91340488.

The previous prime is 91340479. The next prime is 91340527. The reversal of 91340489 is 98404319.

It is an a-pointer prime, because the next prime (91340527) can be obtained adding 91340489 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90878089 + 462400 = 9533^2 + 680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91340489 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91340419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45670244 + 45670245.

It is an arithmetic number, because the mean of its divisors is an integer number (45670245).

Almost surely, 2^91340489 is an apocalyptic number.

It is an amenable number.

91340489 is a deficient number, since it is larger than the sum of its proper divisors (1).

91340489 is an equidigital number, since it uses as much as digits as its factorization.

91340489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 91340489 is about 9557.2218243588. The cubic root of 91340489 is about 450.3544351649.

The spelling of 91340489 in words is "ninety-one million, three hundred forty thousand, four hundred eighty-nine".