91084705 has 4 divisors (see below), whose sum is σ = 109301652. Its totient is φ = 72867760.

The previous prime is 91084703. The next prime is 91084753. The reversal of 91084705 is 50748019.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50748019 = 7 ⋅7249717.

It can be written as a sum of positive squares in 2 ways, for example, as 26635921 + 64448784 = 5161^2 + 8028^2 .

It is not a de Polignac number, because 91084705 - 2¹ = 91084703 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91084703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9108466 + ... + 9108475.

It is an arithmetic number, because the mean of its divisors is an integer number (27325413).

Almost surely, 2^91084705 is an apocalyptic number.

It is an amenable number.

91084705 is a deficient number, since it is larger than the sum of its proper divisors (18216947).

91084705 is a wasteful number, since it uses less digits than its factorization.

91084705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18216946.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 91084705 is about 9543.8307298485. The cubic root of 91084705 is about 449.9336610027.

The spelling of 91084705 in words is "ninety-one million, eighty-four thousand, seven hundred five".