91603353593 has 2 divisors, whose sum is σ = 91603353594. Its totient is φ = 91603353592.

The previous prime is 91603353587. The next prime is 91603353613. The reversal of 91603353593 is 39535330619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69673297849 + 21930055744 = 263957^2 + 148088^2 .

It is an emirp because it is prime and its reverse (39535330619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91603353593 - 2²⁴ = 91586576377 is a prime.

It is not a weakly prime, because it can be changed into another prime (91603343593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45801676796 + 45801676797.

It is an arithmetic number, because the mean of its divisors is an integer number (45801676797).

Almost surely, 2^91603353593 is an apocalyptic number.

It is an amenable number.

91603353593 is a deficient number, since it is larger than the sum of its proper divisors (1).

91603353593 is an equidigital number, since it uses as much as digits as its factorization.

91603353593 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 984150, while the sum is 47.

The spelling of 91603353593 in words is "ninety-one billion, six hundred three million, three hundred fifty-three thousand, five hundred ninety-three".