131871329 has 4 divisors (see below), whose sum is σ = 139628484. Its totient is φ = 124114176.

The previous prime is 131871319. The next prime is 131871359. The reversal of 131871329 is 923178131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 923178131 = 107 ⋅8627833.

It can be written as a sum of positive squares in 2 ways, for example, as 108638929 + 23232400 = 10423^2 + 4820^2 .

It is a cyclic number.

It is not a de Polignac number, because 131871329 - 2⁸ = 131871073 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131871319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3878552 + ... + 3878585.

It is an arithmetic number, because the mean of its divisors is an integer number (34907121).

Almost surely, 2^131871329 is an apocalyptic number.

It is an amenable number.

131871329 is a deficient number, since it is larger than the sum of its proper divisors (7757155).

131871329 is an equidigital number, since it uses as much as digits as its factorization.

131871329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7757154.

The product of its digits is 9072, while the sum is 35.

The square root of 131871329 is about 11483.5242412772. The cubic root of 131871329 is about 508.9988420583.

The spelling of 131871329 in words is "one hundred thirty-one million, eight hundred seventy-one thousand, three hundred twenty-nine".