91350509 has 2 divisors, whose sum is σ = 91350510. Its totient is φ = 91350508.

The previous prime is 91350473. The next prime is 91350541. The reversal of 91350509 is 90505319.

It is an a-pointer prime, because the next prime (91350541) can be obtained adding 91350509 to its sum of digits (32).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81396484 + 9954025 = 9022^2 + 3155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91350509 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_5290844 and since 91350509 and 5290844 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91350599) 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, 45675254 + 45675255.

It is an arithmetic number, because the mean of its divisors is an integer number (45675255).

Almost surely, 2^91350509 is an apocalyptic number.

It is an amenable number.

91350509 is a deficient number, since it is larger than the sum of its proper divisors (1).

91350509 is an equidigital number, since it uses as much as digits as its factorization.

91350509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6075, while the sum is 32.

The square root of 91350509 is about 9557.7460208984. The cubic root of 91350509 is about 450.3709024384.

The spelling of 91350509 in words is "ninety-one million, three hundred fifty thousand, five hundred nine".