91493009 has 2 divisors, whose sum is σ = 91493010. Its totient is φ = 91493008.

The previous prime is 91492991. The next prime is 91493021. The reversal of 91493009 is 90039419.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78712384 + 12780625 = 8872^2 + 3575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91493009 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 91493009.

It is not a weakly prime, because it can be changed into another prime (91493029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45746504 + 45746505.

It is an arithmetic number, because the mean of its divisors is an integer number (45746505).

Almost surely, 2^91493009 is an apocalyptic number.

It is an amenable number.

91493009 is a deficient number, since it is larger than the sum of its proper divisors (1).

91493009 is an equidigital number, since it uses as much as digits as its factorization.

91493009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 91493009 is about 9565.1978024503. The cubic root of 91493009 is about 450.6049624792.

The spelling of 91493009 in words is "ninety-one million, four hundred ninety-three thousand, nine".