91356647 has 2 divisors, whose sum is σ = 91356648. Its totient is φ = 91356646.

The previous prime is 91356619. The next prime is 91356677. The reversal of 91356647 is 74665319.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91356647 - 2¹⁶ = 91291111 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91356677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45678323 + 45678324.

It is an arithmetic number, because the mean of its divisors is an integer number (45678324).

Almost surely, 2^91356647 is an apocalyptic number.

91356647 is a deficient number, since it is larger than the sum of its proper divisors (1).

91356647 is an equidigital number, since it uses as much as digits as its factorization.

91356647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 41.

The square root of 91356647 is about 9558.0671163159. The cubic root of 91356647 is about 450.3809892813.

The spelling of 91356647 in words is "ninety-one million, three hundred fifty-six thousand, six hundred forty-seven".