91071085 has 16 divisors (see below), whose sum is σ = 131472000. Its totient is φ = 59161536.

The previous prime is 91071037. The next prime is 91071089. The reversal of 91071085 is 58017019.

It is not a de Polignac number, because 91071085 - 2¹⁵ = 91038317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91071089) 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, 67810 + ... + 69139.

It is an arithmetic number, because the mean of its divisors is an integer number (8217000).

Almost surely, 2^91071085 is an apocalyptic number.

91071085 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

91071085 is a deficient number, since it is larger than the sum of its proper divisors (40400915).

91071085 is a wasteful number, since it uses less digits than its factorization.

91071085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136980.

The product of its (nonzero) digits is 2520, while the sum is 31.

The square root of 91071085 is about 9543.1171532157. The cubic root of 91071085 is about 449.9112335200.

The spelling of 91071085 in words is "ninety-one million, seventy-one thousand, eighty-five".