131461866 has 20 divisors (see below), whose sum is σ = 294572322. Its totient is φ = 43820568.

The previous prime is 131461849. The next prime is 131461873. The reversal of 131461866 is 668164131.

131461866 is a `hidden beast` number, since 1 + 31 + 4 + 618 + 6 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 127577025 + 3884841 = 11295^2 + 1971^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 131461866.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 405585 + ... + 405908.

Almost surely, 2^131461866 is an apocalyptic number.

131461866 is an abundant number, since it is smaller than the sum of its proper divisors (163110456).

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

131461866 is an equidigital number, since it uses as much as digits as its factorization.

131461866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811507 (or 811498 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 131461866 is about 11465.6820992037. The cubic root of 131461866 is about 508.4714788086.

The spelling of 131461866 in words is "one hundred thirty-one million, four hundred sixty-one thousand, eight hundred sixty-six".