91488389 has 2 divisors, whose sum is σ = 91488390. Its totient is φ = 91488388.

The previous prime is 91488377. The next prime is 91488403. The reversal of 91488389 is 98388419.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90820900 + 667489 = 9530^2 + 817^2 .

It is an emirp because it is prime and its reverse (98388419) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91488389 - 2¹⁶ = 91422853 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91488289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45744194 + 45744195.

It is an arithmetic number, because the mean of its divisors is an integer number (45744195).

Almost surely, 2^91488389 is an apocalyptic number.

It is an amenable number.

91488389 is a deficient number, since it is larger than the sum of its proper divisors (1).

91488389 is an equidigital number, since it uses as much as digits as its factorization.

91488389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 50.

The square root of 91488389 is about 9564.9562989070. The cubic root of 91488389 is about 450.5973778197.

The spelling of 91488389 in words is "ninety-one million, four hundred eighty-eight thousand, three hundred eighty-nine".