131328781 has 8 divisors (see below), whose sum is σ = 140382144. Its totient is φ = 122554080.

The previous prime is 131328761. The next prime is 131328793. The reversal of 131328781 is 187823131.

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

It is a cyclic number.

It is not a de Polignac number, because 131328781 - 2⁷ = 131328653 is a prime.

It is a super-2 number, since 2×131328781² = 34494497437891922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131328761) 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 7 ways as a sum of consecutive naturals, for example, 68691 + ... + 70576.

It is an arithmetic number, because the mean of its divisors is an integer number (17547768).

Almost surely, 2^131328781 is an apocalyptic number.

It is an amenable number.

131328781 is a deficient number, since it is larger than the sum of its proper divisors (9053363).

131328781 is a wasteful number, since it uses less digits than its factorization.

131328781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139331.

The product of its digits is 8064, while the sum is 34.

The square root of 131328781 is about 11459.8770063208. The cubic root of 131328781 is about 508.2998377165.

The spelling of 131328781 in words is "one hundred thirty-one million, three hundred twenty-eight thousand, seven hundred eighty-one".