91161081 has 48 divisors (see below), whose sum is σ = 151377408. Its totient is φ = 52358400.

The previous prime is 91161079. The next prime is 91161127. The reversal of 91161081 is 18016119.

It is not a de Polignac number, because 91161081 - 2¹ = 91161079 is a prime.

It is a super-2 number, since 2×91161081² = 16620685378177122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91161481) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 149880 + ... + 150486.

It is an arithmetic number, because the mean of its divisors is an integer number (3153696).

Almost surely, 2^91161081 is an apocalyptic number.

It is an amenable number.

91161081 is a deficient number, since it is larger than the sum of its proper divisors (60216327).

91161081 is a wasteful number, since it uses less digits than its factorization.

91161081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702 (or 699 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 27.

The square root of 91161081 is about 9547.8312197064. The cubic root of 91161081 is about 450.0593847555.

The spelling of 91161081 in words is "ninety-one million, one hundred sixty-one thousand, eighty-one".