91387929896 has 8 divisors (see below), whose sum is σ = 171352368570. Its totient is φ = 45693964944.

The previous prime is 91387929869. The next prime is 91387929907. The reversal of 91387929896 is 69892978319.

It can be written as a sum of positive squares in only one way, i.e., 62143509796 + 29244420100 = 249286^2 + 171010^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5711745611 + ... + 5711745626.

Almost surely, 2^91387929896 is an apocalyptic number.

It is an amenable number.

91387929896 is a deficient number, since it is larger than the sum of its proper divisors (79964438674).

91387929896 is a wasteful number, since it uses less digits than its factorization.

91387929896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11423491243 (or 11423491239 counting only the distinct ones).

The product of its digits is 105815808, while the sum is 71.

The spelling of 91387929896 in words is "ninety-one billion, three hundred eighty-seven million, nine hundred twenty-nine thousand, eight hundred ninety-six".