11561863 has 2 divisors, whose sum is σ = 11561864. Its totient is φ = 11561862.

The previous prime is 11561843. The next prime is 11561903. The reversal of 11561863 is 36816511.

11561863 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11561863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11561833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5780931 + 5780932.

It is an arithmetic number, because the mean of its divisors is an integer number (5780932).

Almost surely, 2^11561863 is an apocalyptic number.

11561863 is a deficient number, since it is larger than the sum of its proper divisors (1).

11561863 is an equidigital number, since it uses as much as digits as its factorization.

11561863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 31.

The square root of 11561863 is about 3400.2739595509. The cubic root of 11561863 is about 226.1218897660.

The spelling of 11561863 in words is "eleven million, five hundred sixty-one thousand, eight hundred sixty-three".