91489912 has 8 divisors (see below), whose sum is σ = 171543600. Its totient is φ = 45744952.

The previous prime is 91489873. The next prime is 91489919. The reversal of 91489912 is 21998419.

It is a happy number.

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 (91489919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5718112 + ... + 5718127.

It is an arithmetic number, because the mean of its divisors is an integer number (21442950).

Almost surely, 2^91489912 is an apocalyptic number.

It is an amenable number.

91489912 is a deficient number, since it is larger than the sum of its proper divisors (80053688).

91489912 is a wasteful number, since it uses less digits than its factorization.

91489912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11436245 (or 11436241 counting only the distinct ones).

The product of its digits is 46656, while the sum is 43.

The square root of 91489912 is about 9565.0359121124. The cubic root of 91489912 is about 450.5998781588.

The spelling of 91489912 in words is "ninety-one million, four hundred eighty-nine thousand, nine hundred twelve".