131320665 has 96 divisors (see below), whose sum is σ = 279002880. Its totient is φ = 55775232.

The previous prime is 131320633. The next prime is 131320669. The reversal of 131320665 is 566023131.

It is not a de Polignac number, because 131320665 - 2⁵ = 131320633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131320669) 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 95 ways as a sum of consecutive naturals, for example, 733546 + ... + 733724.

It is an arithmetic number, because the mean of its divisors is an integer number (2906280).

Almost surely, 2^131320665 is an apocalyptic number.

131320665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131320665 is an abundant number, since it is smaller than the sum of its proper divisors (147682215).

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

131320665 is a wasteful number, since it uses less digits than its factorization.

131320665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351 (or 348 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 131320665 is about 11459.5228958277. The cubic root of 131320665 is about 508.2893666772.

Adding to 131320665 its reverse (566023131), we get a palindrome (697343796).

The spelling of 131320665 in words is "one hundred thirty-one million, three hundred twenty thousand, six hundred sixty-five".