91284647 has 2 divisors, whose sum is σ = 91284648. Its totient is φ = 91284646.

The previous prime is 91284593. The next prime is 91284671. The reversal of 91284647 is 74648219.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91284647 - 2¹² = 91280551 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 (91284047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45642323 + 45642324.

It is an arithmetic number, because the mean of its divisors is an integer number (45642324).

Almost surely, 2^91284647 is an apocalyptic number.

91284647 is a deficient number, since it is larger than the sum of its proper divisors (1).

91284647 is an equidigital number, since it uses as much as digits as its factorization.

91284647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 41.

The square root of 91284647 is about 9554.2999220246. The cubic root of 91284647 is about 450.2626400973.

The spelling of 91284647 in words is "ninety-one million, two hundred eighty-four thousand, six hundred forty-seven".