91613687 has 16 divisors (see below), whose sum is σ = 106310400. Its totient is φ = 78071040.

The previous prime is 91613647. The next prime is 91613699. The reversal of 91613687 is 78631619.

It is a cyclic number.

It is not a de Polignac number, because 91613687 - 2¹² = 91609591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91613647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18014 + ... + 22532.

It is an arithmetic number, because the mean of its divisors is an integer number (6644400).

Almost surely, 2^91613687 is an apocalyptic number.

91613687 is a gapful number since it is divisible by the number (97) formed by its first and last digit.

91613687 is a deficient number, since it is larger than the sum of its proper divisors (14696713).

91613687 is a wasteful number, since it uses less digits than its factorization.

91613687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4646.

The product of its digits is 54432, while the sum is 41.

The square root of 91613687 is about 9571.5039048208. The cubic root of 91613687 is about 450.8029893222.

The spelling of 91613687 in words is "ninety-one million, six hundred thirteen thousand, six hundred eighty-seven".