91993909514 has 36 divisors (see below), whose sum is σ = 157906383894. Its totient is φ = 39949734528.

The previous prime is 91993909507. The next prime is 91993909517. The reversal of 91993909514 is 41590939919.

It can be written as a sum of positive squares in 3 ways, for example, as 84342033889 + 7651875625 = 290417^2 + 87475^2 .

It is not an unprimeable number, because it can be changed into a prime (91993909517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 26289737 + ... + 26293235.

Almost surely, 2^91993909514 is an apocalyptic number.

91993909514 is a deficient number, since it is larger than the sum of its proper divisors (65912474380).

91993909514 is an equidigital number, since it uses as much as digits as its factorization.

91993909514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7047 (or 3531 counting only the distinct ones).

The product of its (nonzero) digits is 3542940, while the sum is 59.

The spelling of 91993909514 in words is "ninety-one billion, nine hundred ninety-three million, nine hundred nine thousand, five hundred fourteen".