91270085 has 8 divisors (see below), whose sum is σ = 110324376. Its totient is φ = 72482560.

The previous prime is 91270079. The next prime is 91270087. The reversal of 91270085 is 58007219.

It can be written as a sum of positive squares in 4 ways, for example, as 42172036 + 49098049 = 6494^2 + 7007^2 .

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

It is not a de Polignac number, because 91270085 - 2¹⁶ = 91204549 is a prime.

It is a super-3 number, since 3×91270085³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91270087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65936 + ... + 67305.

It is an arithmetic number, because the mean of its divisors is an integer number (13790547).

Almost surely, 2^91270085 is an apocalyptic number.

It is an amenable number.

91270085 is a deficient number, since it is larger than the sum of its proper divisors (19054291).

91270085 is a wasteful number, since it uses less digits than its factorization.

91270085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133383.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 91270085 is about 9553.5378263762. The cubic root of 91270085 is about 450.2386964096.

The spelling of 91270085 in words is "ninety-one million, two hundred seventy thousand, eighty-five".