91613647 has 2 divisors, whose sum is σ = 91613648. Its totient is φ = 91613646.

The previous prime is 91613603. The next prime is 91613699. The reversal of 91613647 is 74631619.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91613647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91613747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45806823 + 45806824.

It is an arithmetic number, because the mean of its divisors is an integer number (45806824).

Almost surely, 2^91613647 is an apocalyptic number.

91613647 is a deficient number, since it is larger than the sum of its proper divisors (1).

91613647 is an equidigital number, since it uses as much as digits as its factorization.

91613647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 37.

The square root of 91613647 is about 9571.5018152848. The cubic root of 91613647 is about 450.8029237129.

The spelling of 91613647 in words is "ninety-one million, six hundred thirteen thousand, six hundred forty-seven".