91427813 has 2 divisors, whose sum is σ = 91427814. Its totient is φ = 91427812.

The previous prime is 91427801. The next prime is 91427839. The reversal of 91427813 is 31872419.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57123364 + 34304449 = 7558^2 + 5857^2 .

It is an emirp because it is prime and its reverse (31872419) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91427813 - 2¹⁴ = 91411429 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91447813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45713906 + 45713907.

It is an arithmetic number, because the mean of its divisors is an integer number (45713907).

Almost surely, 2^91427813 is an apocalyptic number.

It is an amenable number.

91427813 is a deficient number, since it is larger than the sum of its proper divisors (1).

91427813 is an equidigital number, since it uses as much as digits as its factorization.

91427813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 91427813 is about 9561.7892154136. The cubic root of 91427813 is about 450.4979064969.

The spelling of 91427813 in words is "ninety-one million, four hundred twenty-seven thousand, eight hundred thirteen".