91481585 has 8 divisors (see below), whose sum is σ = 118222440. Its totient is φ = 67555584.

The previous prime is 91481581. The next prime is 91481609. The reversal of 91481585 is 58518419.

It can be written as a sum of positive squares in 4 ways, for example, as 1079521 + 90402064 = 1039^2 + 9508^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 91481585 - 2² = 91481581 is a prime.

It is a super-2 number, since 2×91481585² = 16737760788224450, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91481581) 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 7 ways as a sum of consecutive naturals, for example, 703640 + ... + 703769.

It is an arithmetic number, because the mean of its divisors is an integer number (14777805).

Almost surely, 2^91481585 is an apocalyptic number.

It is an amenable number.

91481585 is a deficient number, since it is larger than the sum of its proper divisors (26740855).

91481585 is a wasteful number, since it uses less digits than its factorization.

91481585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407427.

The product of its digits is 57600, while the sum is 41.

The square root of 91481585 is about 9564.6006189490. The cubic root of 91481585 is about 450.5862072198.

The spelling of 91481585 in words is "ninety-one million, four hundred eighty-one thousand, five hundred eighty-five".