131005866 has 16 divisors (see below), whose sum is σ = 263772000. Its totient is φ = 43375248.

The previous prime is 131005841. The next prime is 131005883. The reversal of 131005866 is 668500131.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72376 + ... + 74163.

It is an arithmetic number, because the mean of its divisors is an integer number (16485750).

Almost surely, 2^131005866 is an apocalyptic number.

131005866 is an abundant number, since it is smaller than the sum of its proper divisors (132766134).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131005866 is a wasteful number, since it uses less digits than its factorization.

131005866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146693.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 131005866 is about 11445.7793967908. The cubic root of 131005866 is about 507.8828883529.

Adding to 131005866 its reverse (668500131), we get a palindrome (799505997).

The spelling of 131005866 in words is "one hundred thirty-one million, five thousand, eight hundred sixty-six".