11961563 has 2 divisors, whose sum is σ = 11961564. Its totient is φ = 11961562.

The previous prime is 11961527. The next prime is 11961569. The reversal of 11961563 is 36516911.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11961563 - 2¹⁴ = 11945179 is a prime.

It is not a weakly prime, because it can be changed into another prime (11961569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5980781 + 5980782.

It is an arithmetic number, because the mean of its divisors is an integer number (5980782).

Almost surely, 2^11961563 is an apocalyptic number.

11961563 is a deficient number, since it is larger than the sum of its proper divisors (1).

11961563 is an equidigital number, since it uses as much as digits as its factorization.

11961563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 32.

The square root of 11961563 is about 3458.5492623353. The cubic root of 11961563 is about 228.6981460495.

The spelling of 11961563 in words is "eleven million, nine hundred sixty-one thousand, five hundred sixty-three".