91705861 has 4 divisors (see below), whose sum is σ = 98760172. Its totient is φ = 84651552.

The previous prime is 91705841. The next prime is 91705891. The reversal of 91705861 is 16850719.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49702500 + 42003361 = 7050^2 + 6481^2 .

It is a cyclic number.

It is not a de Polignac number, because 91705861 - 2⁹ = 91705349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91705861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91705841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3527136 + ... + 3527161.

It is an arithmetic number, because the mean of its divisors is an integer number (24690043).

Almost surely, 2^91705861 is an apocalyptic number.

It is an amenable number.

91705861 is a deficient number, since it is larger than the sum of its proper divisors (7054311).

91705861 is a wasteful number, since it uses less digits than its factorization.

91705861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7054310.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 91705861 is about 9576.3177161161. The cubic root of 91705861 is about 450.9541253529.

The spelling of 91705861 in words is "ninety-one million, seven hundred five thousand, eight hundred sixty-one".