91009165 has 8 divisors (see below), whose sum is σ = 117611928. Its totient is φ = 67206720.

The previous prime is 91009141. The next prime is 91009187. The reversal of 91009165 is 56190019.

It can be written as a sum of positive squares in 4 ways, for example, as 12208036 + 78801129 = 3494^2 + 8877^2 .

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

It is not a de Polignac number, because 91009165 - 2²¹ = 88912013 is a prime.

It is a super-2 number, since 2×91009165² = 16565336227994450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 700006 + ... + 700135.

It is an arithmetic number, because the mean of its divisors is an integer number (14701491).

Almost surely, 2^91009165 is an apocalyptic number.

It is an amenable number.

91009165 is a deficient number, since it is larger than the sum of its proper divisors (26602763).

91009165 is a wasteful number, since it uses less digits than its factorization.

91009165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400159.

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 91009165 is about 9539.8723786013. The cubic root of 91009165 is about 449.8092442526.

The spelling of 91009165 in words is "ninety-one million, nine thousand, one hundred sixty-five".