91191896 has 8 divisors (see below), whose sum is σ = 170984820. Its totient is φ = 45595944.

The previous prime is 91191871. The next prime is 91191899. The reversal of 91191896 is 69819119.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91191899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5699486 + ... + 5699501.

Almost surely, 2^91191896 is an apocalyptic number.

It is an amenable number.

91191896 is a deficient number, since it is larger than the sum of its proper divisors (79792924).

91191896 is a wasteful number, since it uses less digits than its factorization.

91191896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11398993 (or 11398989 counting only the distinct ones).

The product of its digits is 34992, while the sum is 44.

The square root of 91191896 is about 9549.4448006154. Note that the first 3 decimals coincide. The cubic root of 91191896 is about 450.1100899374.

The spelling of 91191896 in words is "ninety-one million, one hundred ninety-one thousand, eight hundred ninety-six".