91357663 has 2 divisors, whose sum is σ = 91357664. Its totient is φ = 91357662.

The previous prime is 91357661. The next prime is 91357703. The reversal of 91357663 is 36675319.

It is an a-pointer prime, because the next prime (91357703) can be obtained adding 91357663 to its sum of digits (40).

It is a weak prime.

It is an emirp because it is prime and its reverse (36675319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91357663 - 2¹ = 91357661 is a prime.

Together with 91357661, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91357661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45678831 + 45678832.

It is an arithmetic number, because the mean of its divisors is an integer number (45678832).

Almost surely, 2^91357663 is an apocalyptic number.

91357663 is a deficient number, since it is larger than the sum of its proper divisors (1).

91357663 is an equidigital number, since it uses as much as digits as its factorization.

91357663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102060, while the sum is 40.

The square root of 91357663 is about 9558.1202649893. The cubic root of 91357663 is about 450.3826588748.

The spelling of 91357663 in words is "ninety-one million, three hundred fifty-seven thousand, six hundred sixty-three".