91705073 has 2 divisors, whose sum is σ = 91705074. Its totient is φ = 91705072.

The previous prime is 91705067. The next prime is 91705087. The reversal of 91705073 is 37050719.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48052624 + 43652449 = 6932^2 + 6607^2 .

It is a cyclic number.

It is not a de Polignac number, because 91705073 - 2¹⁸ = 91442929 is a prime.

It is not a weakly prime, because it can be changed into another prime (91705013) 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 as a sum of consecutive naturals, namely, 45852536 + 45852537.

It is an arithmetic number, because the mean of its divisors is an integer number (45852537).

Almost surely, 2^91705073 is an apocalyptic number.

It is an amenable number.

91705073 is a deficient number, since it is larger than the sum of its proper divisors (1).

91705073 is an equidigital number, since it uses as much as digits as its factorization.

91705073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6615, while the sum is 32.

The square root of 91705073 is about 9576.2765728648. The cubic root of 91705073 is about 450.9528337129.

The spelling of 91705073 in words is "ninety-one million, seven hundred five thousand, seventy-three".