91338749 has 2 divisors, whose sum is σ = 91338750. Its totient is φ = 91338748.

The previous prime is 91338743. The next prime is 91338763. The reversal of 91338749 is 94783319.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91336249 + 2500 = 9557^2 + 50^2 .

It is an emirp because it is prime and its reverse (94783319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91338749 - 2⁴ = 91338733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91338743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45669374 + 45669375.

It is an arithmetic number, because the mean of its divisors is an integer number (45669375).

Almost surely, 2^91338749 is an apocalyptic number.

It is an amenable number.

91338749 is a deficient number, since it is larger than the sum of its proper divisors (1).

91338749 is an equidigital number, since it uses as much as digits as its factorization.

91338749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 44.

The square root of 91338749 is about 9557.1307932873. The cubic root of 91338749 is about 450.3515754558.

The spelling of 91338749 in words is "ninety-one million, three hundred thirty-eight thousand, seven hundred forty-nine".