91040785949 has 2 divisors, whose sum is σ = 91040785950. Its totient is φ = 91040785948.

The previous prime is 91040785919. The next prime is 91040785951. The reversal of 91040785949 is 94958704019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85560345049 + 5480440900 = 292507^2 + 74030^2 .

It is an emirp because it is prime and its reverse (94958704019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91040785949 - 2¹⁶ = 91040720413 is a prime.

It is a Sophie Germain prime.

Together with 91040785951, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 91040785894 and 91040785903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91040785919) 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, 45520392974 + 45520392975.

It is an arithmetic number, because the mean of its divisors is an integer number (45520392975).

Almost surely, 2^91040785949 is an apocalyptic number.

It is an amenable number.

91040785949 is a deficient number, since it is larger than the sum of its proper divisors (1).

91040785949 is an equidigital number, since it uses as much as digits as its factorization.

91040785949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3265920, while the sum is 56.

The spelling of 91040785949 in words is "ninety-one billion, forty million, seven hundred eighty-five thousand, nine hundred forty-nine".