91000771 has 16 divisors (see below), whose sum is σ = 96864768. Its totient is φ = 85377600.

The previous prime is 91000769. The next prime is 91000799. The reversal of 91000771 is 17700019.

It is a cyclic number.

It is not a de Polignac number, because 91000771 - 2¹ = 91000769 is a prime.

It is a super-2 number, since 2×91000771² = 16562280645188882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91000751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124810 + ... + 125536.

It is an arithmetic number, because the mean of its divisors is an integer number (6054048).

Almost surely, 2^91000771 is an apocalyptic number.

91000771 is a deficient number, since it is larger than the sum of its proper divisors (5863997).

91000771 is a wasteful number, since it uses less digits than its factorization.

91000771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882.

The product of its (nonzero) digits is 441, while the sum is 25.

The square root of 91000771 is about 9539.4324254643. The cubic root of 91000771 is about 449.7954148217.

The spelling of 91000771 in words is "ninety-one million, seven hundred seventy-one", and thus it is an aban number.