91513668 has 12 divisors (see below), whose sum is σ = 213531920. Its totient is φ = 30504552.

The previous prime is 91513663. The next prime is 91513673. The reversal of 91513668 is 86631519.

It is an interprime number because it is at equal distance from previous prime (91513663) and next prime (91513673).

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (91513663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3813058 + ... + 3813081.

Almost surely, 2^91513668 is an apocalyptic number.

It is an amenable number.

91513668 is an abundant number, since it is smaller than the sum of its proper divisors (122018252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91513668 is a wasteful number, since it uses less digits than its factorization.

91513668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7626146 (or 7626144 counting only the distinct ones).

The product of its digits is 38880, while the sum is 39.

The square root of 91513668 is about 9566.2776459812. The cubic root of 91513668 is about 450.6388752610.

The spelling of 91513668 in words is "ninety-one million, five hundred thirteen thousand, six hundred sixty-eight".