91536563 has 2 divisors, whose sum is σ = 91536564. Its totient is φ = 91536562.

The previous prime is 91536491. The next prime is 91536569. The reversal of 91536563 is 36563519.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91536563 - 2¹⁶ = 91471027 is a prime.

It is not a weakly prime, because it can be changed into another prime (91536569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45768281 + 45768282.

It is an arithmetic number, because the mean of its divisors is an integer number (45768282).

Almost surely, 2^91536563 is an apocalyptic number.

91536563 is a deficient number, since it is larger than the sum of its proper divisors (1).

91536563 is an equidigital number, since it uses as much as digits as its factorization.

91536563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72900, while the sum is 38.

The square root of 91536563 is about 9567.4742225940. The cubic root of 91536563 is about 450.6764525869.

The spelling of 91536563 in words is "ninety-one million, five hundred thirty-six thousand, five hundred sixty-three".