11891563 has 2 divisors, whose sum is σ = 11891564. Its totient is φ = 11891562.

The previous prime is 11891543. The next prime is 11891591. The reversal of 11891563 is 36519811.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11891563 is a prime.

It is not a weakly prime, because it can be changed into another prime (11891513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5945781 + 5945782.

It is an arithmetic number, because the mean of its divisors is an integer number (5945782).

Almost surely, 2^11891563 is an apocalyptic number.

11891563 is a deficient number, since it is larger than the sum of its proper divisors (1).

11891563 is an equidigital number, since it uses as much as digits as its factorization.

11891563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 34.

The square root of 11891563 is about 3448.4145632450. The cubic root of 11891563 is about 228.2511531681.

The spelling of 11891563 in words is "eleven million, eight hundred ninety-one thousand, five hundred sixty-three".