91693894393 has 2 divisors, whose sum is σ = 91693894394. Its totient is φ = 91693894392.

The previous prime is 91693894373. The next prime is 91693894433. The reversal of 91693894393 is 39349839619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60462875664 + 31231018729 = 245892^2 + 176723^2 .

It is a cyclic number.

It is not a de Polignac number, because 91693894393 - 2⁵ = 91693894361 is a prime.

It is not a weakly prime, because it can be changed into another prime (91693894343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45846947196 + 45846947197.

It is an arithmetic number, because the mean of its divisors is an integer number (45846947197).

Almost surely, 2^91693894393 is an apocalyptic number.

It is an amenable number.

91693894393 is a deficient number, since it is larger than the sum of its proper divisors (1).

91693894393 is an equidigital number, since it uses as much as digits as its factorization.

91693894393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34012224, while the sum is 64.

The spelling of 91693894393 in words is "ninety-one billion, six hundred ninety-three million, eight hundred ninety-four thousand, three hundred ninety-three".