131320506 has 8 divisors (see below), whose sum is σ = 262641024. Its totient is φ = 43773500.

The previous prime is 131320487. The next prime is 131320507. The reversal of 131320506 is 605023131.

It is a sphenic number, since it is the product of 3 distinct primes.

131320506 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131320507) 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 3 ways as a sum of consecutive naturals, for example, 10943370 + ... + 10943381.

It is an arithmetic number, because the mean of its divisors is an integer number (32830128).

Almost surely, 2^131320506 is an apocalyptic number.

131320506 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

131320506 is a wasteful number, since it uses less digits than its factorization.

131320506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21886756.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 131320506 is about 11459.5159583640. The cubic root of 131320506 is about 508.2891615355.

Adding to 131320506 its reverse (605023131), we get a palindrome (736343637).

The spelling of 131320506 in words is "one hundred thirty-one million, three hundred twenty thousand, five hundred six".