131439829 has 2 divisors, whose sum is σ = 131439830. Its totient is φ = 131439828.

The previous prime is 131439797. The next prime is 131439857. The reversal of 131439829 is 928934131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85063729 + 46376100 = 9223^2 + 6810^2 .

It is a cyclic number.

It is not a de Polignac number, because 131439829 - 2⁵ = 131439797 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 131439791 and 131439800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131439899) 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 as a sum of consecutive naturals, namely, 65719914 + 65719915.

It is an arithmetic number, because the mean of its divisors is an integer number (65719915).

Almost surely, 2^131439829 is an apocalyptic number.

It is an amenable number.

131439829 is a deficient number, since it is larger than the sum of its proper divisors (1).

131439829 is an equidigital number, since it uses as much as digits as its factorization.

131439829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 40.

The square root of 131439829 is about 11464.7210607149. The cubic root of 131439829 is about 508.4430654684.

The spelling of 131439829 in words is "one hundred thirty-one million, four hundred thirty-nine thousand, eight hundred twenty-nine".