91086665 has 8 divisors (see below), whose sum is σ = 115056960. Its totient is φ = 69034032.

The previous prime is 91086661. The next prime is 91086683. The reversal of 91086665 is 56668019.

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 91086665 - 2² = 91086661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91086661) 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, 479309 + ... + 479498.

It is an arithmetic number, because the mean of its divisors is an integer number (14382120).

Almost surely, 2^91086665 is an apocalyptic number.

91086665 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

91086665 is a deficient number, since it is larger than the sum of its proper divisors (23970295).

91086665 is a wasteful number, since it uses less digits than its factorization.

91086665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958831.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 91086665 is about 9543.9334134308. The cubic root of 91086665 is about 449.9368882684.

The spelling of 91086665 in words is "ninety-one million, eighty-six thousand, six hundred sixty-five".