91648633 has 2 divisors, whose sum is σ = 91648634. Its totient is φ = 91648632.

The previous prime is 91648631. The next prime is 91648663. The reversal of 91648633 is 33684619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89927289 + 1721344 = 9483^2 + 1312^2 .

It is an emirp because it is prime and its reverse (33684619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91648633 - 2¹ = 91648631 is a prime.

Together with 91648631, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (91648631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45824316 + 45824317.

It is an arithmetic number, because the mean of its divisors is an integer number (45824317).

Almost surely, 2^91648633 is an apocalyptic number.

It is an amenable number.

91648633 is a deficient number, since it is larger than the sum of its proper divisors (1).

91648633 is an equidigital number, since it uses as much as digits as its factorization.

91648633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 40.

The square root of 91648633 is about 9573.3292537132. The cubic root of 91648633 is about 450.8603015686.

The spelling of 91648633 in words is "ninety-one million, six hundred forty-eight thousand, six hundred thirty-three".