91516638 has 8 divisors (see below), whose sum is σ = 183033288. Its totient is φ = 30505544.

The previous prime is 91516631. The next prime is 91516679. The reversal of 91516638 is 83661519.

It is a sphenic number, since it is the product of 3 distinct primes.

91516638 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 91516596 and 91516605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91516631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7626381 + ... + 7626392.

It is an arithmetic number, because the mean of its divisors is an integer number (22879161).

Almost surely, 2^91516638 is an apocalyptic number.

91516638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

91516638 is a wasteful number, since it uses less digits than its factorization.

91516638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15252778.

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

The square root of 91516638 is about 9566.4328775150. The cubic root of 91516638 is about 450.6437502450.

The spelling of 91516638 in words is "ninety-one million, five hundred sixteen thousand, six hundred thirty-eight".