91143613 has 24 divisors (see below), whose sum is σ = 108017280. Its totient is φ = 76560000.

The previous prime is 91143601. The next prime is 91143629. The reversal of 91143613 is 31634119.

It is a de Polignac number, because none of the positive numbers 2^k-91143613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91143673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120988 + ... + 121738.

It is an arithmetic number, because the mean of its divisors is an integer number (4500720).

Almost surely, 2^91143613 is an apocalyptic number.

It is an amenable number.

91143613 is a deficient number, since it is larger than the sum of its proper divisors (16873667).

91143613 is a wasteful number, since it uses less digits than its factorization.

91143613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849 (or 838 counting only the distinct ones).

The product of its digits is 1944, while the sum is 28.

The square root of 91143613 is about 9546.9164131671. The cubic root of 91143613 is about 450.0306365973.

The spelling of 91143613 in words is "ninety-one million, one hundred forty-three thousand, six hundred thirteen".