131686329 has 4 divisors (see below), whose sum is σ = 175581776. Its totient is φ = 87790884.

The previous prime is 131686273. The next prime is 131686333. The reversal of 131686329 is 923686131.

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 not a de Polignac number, because 131686329 - 2¹² = 131682233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131686229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21947719 + ... + 21947724.

It is an arithmetic number, because the mean of its divisors is an integer number (43895444).

Almost surely, 2^131686329 is an apocalyptic number.

It is an amenable number.

131686329 is a deficient number, since it is larger than the sum of its proper divisors (43895447).

131686329 is an equidigital number, since it uses as much as digits as its factorization.

131686329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43895446.

The product of its digits is 46656, while the sum is 39.

The square root of 131686329 is about 11475.4663957505. The cubic root of 131686329 is about 508.7607087838.

The spelling of 131686329 in words is "one hundred thirty-one million, six hundred eighty-six thousand, three hundred twenty-nine".