131682781 has 4 divisors (see below), whose sum is σ = 131739552. Its totient is φ = 131626012.

The previous prime is 131682769. The next prime is 131682839. The reversal of 131682781 is 187286131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131682781 - 2¹¹ = 131680733 is a prime.

It is a super-2 number, since 2×131682781² = 34680709623787922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131682781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131682701) 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, 24751 + ... + 29596.

It is an arithmetic number, because the mean of its divisors is an integer number (32934888).

Almost surely, 2^131682781 is an apocalyptic number.

It is an amenable number.

131682781 is a deficient number, since it is larger than the sum of its proper divisors (56771).

131682781 is an equidigital number, since it uses as much as digits as its factorization.

131682781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56770.

The product of its digits is 16128, while the sum is 37.

The square root of 131682781 is about 11475.3118040426. The cubic root of 131682781 is about 508.7561395947.

The spelling of 131682781 in words is "one hundred thirty-one million, six hundred eighty-two thousand, seven hundred eighty-one".