131868644 has 6 divisors (see below), whose sum is σ = 230770134. Its totient is φ = 65934320.

The previous prime is 131868631. The next prime is 131868673. The reversal of 131868644 is 446868131.

131868644 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 91393600 + 40475044 = 9560^2 + 6362^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16483577 + ... + 16483584.

It is an arithmetic number, because the mean of its divisors is an integer number (38461689).

Almost surely, 2^131868644 is an apocalyptic number.

It is an amenable number.

131868644 is a deficient number, since it is larger than the sum of its proper divisors (98901490).

131868644 is a wasteful number, since it uses less digits than its factorization.

131868644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32967165 (or 32967163 counting only the distinct ones).

The product of its digits is 110592, while the sum is 41.

The square root of 131868644 is about 11483.4073340625. The cubic root of 131868644 is about 508.9953875011.

The spelling of 131868644 in words is "one hundred thirty-one million, eight hundred sixty-eight thousand, six hundred forty-four".