91069813 has 2 divisors, whose sum is σ = 91069814. Its totient is φ = 91069812.

The previous prime is 91069807. The next prime is 91069837. The reversal of 91069813 is 31896019.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50594769 + 40475044 = 7113^2 + 6362^2 .

It is an emirp because it is prime and its reverse (31896019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91069813 - 2⁹ = 91069301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91069883) 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, 45534906 + 45534907.

It is an arithmetic number, because the mean of its divisors is an integer number (45534907).

Almost surely, 2^91069813 is an apocalyptic number.

It is an amenable number.

91069813 is a deficient number, since it is larger than the sum of its proper divisors (1).

91069813 is an equidigital number, since it uses as much as digits as its factorization.

91069813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 91069813 is about 9543.0505080923. The cubic root of 91069813 is about 449.9091388568.

The spelling of 91069813 in words is "ninety-one million, sixty-nine thousand, eight hundred thirteen".