91081653 has 8 divisors (see below), whose sum is σ = 130783968. Its totient is φ = 56050224.

The previous prime is 91081651. The next prime is 91081673. The reversal of 91081653 is 35618019.

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

It is not a de Polignac number, because 91081653 - 2¹ = 91081651 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91081651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1167675 + ... + 1167752.

It is an arithmetic number, because the mean of its divisors is an integer number (16347996).

Almost surely, 2^91081653 is an apocalyptic number.

It is an amenable number.

91081653 is a deficient number, since it is larger than the sum of its proper divisors (39702315).

91081653 is a wasteful number, since it uses less digits than its factorization.

91081653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2335443.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 91081653 is about 9543.6708346422. The cubic root of 91081653 is about 449.9286355967.

The spelling of 91081653 in words is "ninety-one million, eighty-one thousand, six hundred fifty-three".