91516087 has 4 divisors (see below), whose sum is σ = 98555800. Its totient is φ = 84476376.

The previous prime is 91516081. The next prime is 91516093. The reversal of 91516087 is 78061519.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (91516081) and next prime (91516093).

It is a cyclic number.

It is not a de Polignac number, because 91516087 - 2³ = 91516079 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 (91516081) 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, 3519837 + ... + 3519862.

It is an arithmetic number, because the mean of its divisors is an integer number (24638950).

Almost surely, 2^91516087 is an apocalyptic number.

91516087 is a deficient number, since it is larger than the sum of its proper divisors (7039713).

91516087 is a wasteful number, since it uses less digits than its factorization.

91516087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7039712.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 91516087 is about 9566.4040788585. The cubic root of 91516087 is about 450.6428458367.

The spelling of 91516087 in words is "ninety-one million, five hundred sixteen thousand, eighty-seven".