91064749 has 2 divisors, whose sum is σ = 91064750. Its totient is φ = 91064748.

The previous prime is 91064723. The next prime is 91064773. The reversal of 91064749 is 94746019.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78234025 + 12830724 = 8845^2 + 3582^2 .

It is an emirp because it is prime and its reverse (94746019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91064749 - 2⁵ = 91064717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91064849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45532374 + 45532375.

It is an arithmetic number, because the mean of its divisors is an integer number (45532375).

Almost surely, 2^91064749 is an apocalyptic number.

It is an amenable number.

91064749 is a deficient number, since it is larger than the sum of its proper divisors (1).

91064749 is an equidigital number, since it uses as much as digits as its factorization.

91064749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 91064749 is about 9542.7851804387. The cubic root of 91064749 is about 449.9007995325.

The spelling of 91064749 in words is "ninety-one million, sixty-four thousand, seven hundred forty-nine".