91518087 has 4 divisors (see below), whose sum is σ = 122024120. Its totient is φ = 61012056.

The previous prime is 91518083. The next prime is 91518101. The reversal of 91518087 is 78081519.

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

It is not a de Polignac number, because 91518087 - 2² = 91518083 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 (91518083) 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, 15253012 + ... + 15253017.

It is an arithmetic number, because the mean of its divisors is an integer number (30506030).

Almost surely, 2^91518087 is an apocalyptic number.

91518087 is a deficient number, since it is larger than the sum of its proper divisors (30506033).

91518087 is a wasteful number, since it uses less digits than its factorization.

91518087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30506032.

The product of its (nonzero) digits is 20160, while the sum is 39.

The square root of 91518087 is about 9566.5086107733. The cubic root of 91518087 is about 450.6461286079.

The spelling of 91518087 in words is "ninety-one million, five hundred eighteen thousand, eighty-seven".