861136263 has 24 divisors (see below), whose sum is σ = 1340757600. Its totient is φ = 529450560.

The previous prime is 861136249. The next prime is 861136267. The reversal of 861136263 is 362631168.

861136263 is a `hidden beast` number, since 8 + 611 + 36 + 2 + 6 + 3 = 666.

It is not a de Polignac number, because 861136263 - 2⁵ = 861136231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861136267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 161053 + ... + 166313.

It is an arithmetic number, because the mean of its divisors is an integer number (55864900).

Almost surely, 2^861136263 is an apocalyptic number.

861136263 is a deficient number, since it is larger than the sum of its proper divisors (479621337).

861136263 is a wasteful number, since it uses less digits than its factorization.

861136263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6679 (or 6676 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 861136263 is about 29345.1233256908. The cubic root of 861136263 is about 951.3871749606.

The spelling of 861136263 in words is "eight hundred sixty-one million, one hundred thirty-six thousand, two hundred sixty-three".