131605312 has 14 divisors (see below), whose sum is σ = 261154418. Its totient is φ = 65802624.

The previous prime is 131605301. The next prime is 131605319. The reversal of 131605312 is 213506131.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 80568576 + 51036736 = 8976^2 + 7144^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131605319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1028103 + ... + 1028230.

It is an arithmetic number, because the mean of its divisors is an integer number (18653887).

Almost surely, 2^131605312 is an apocalyptic number.

It is an amenable number.

131605312 is a deficient number, since it is larger than the sum of its proper divisors (129549106).

131605312 is an equidigital number, since it uses as much as digits as its factorization.

131605312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2056345 (or 2056335 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 131605312 is about 11471.9358436142. The cubic root of 131605312 is about 508.6563529193.

The spelling of 131605312 in words is "one hundred thirty-one million, six hundred five thousand, three hundred twelve".