91064773 has 2 divisors, whose sum is σ = 91064774. Its totient is φ = 91064772.

The previous prime is 91064749. The next prime is 91064791. The reversal of 91064773 is 37746019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62995969 + 28068804 = 7937^2 + 5298^2 .

It is an emirp because it is prime and its reverse (37746019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91064773 - 2⁹ = 91064261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91064713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45532386 + 45532387.

It is an arithmetic number, because the mean of its divisors is an integer number (45532387).

Almost surely, 2^91064773 is an apocalyptic number.

It is an amenable number.

91064773 is a deficient number, since it is larger than the sum of its proper divisors (1).

91064773 is an equidigital number, since it uses as much as digits as its factorization.

91064773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 91064773 is about 9542.7864379331. The cubic root of 91064773 is about 449.9008390561.

The spelling of 91064773 in words is "ninety-one million, sixty-four thousand, seven hundred seventy-three".