91007563 has 2 divisors, whose sum is σ = 91007564. Its totient is φ = 91007562.

The previous prime is 91007551. The next prime is 91007569. The reversal of 91007563 is 36570019.

It is a strong prime.

It is an emirp because it is prime and its reverse (36570019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91007563 - 2⁹ = 91007051 is a prime.

It is not a weakly prime, because it can be changed into another prime (91007569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45503781 + 45503782.

It is an arithmetic number, because the mean of its divisors is an integer number (45503782).

Almost surely, 2^91007563 is an apocalyptic number.

91007563 is a deficient number, since it is larger than the sum of its proper divisors (1).

91007563 is an equidigital number, since it uses as much as digits as its factorization.

91007563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 91007563 is about 9539.7884148444. The cubic root of 91007563 is about 449.8066049630.

The spelling of 91007563 in words is "ninety-one million, seven thousand, five hundred sixty-three".