81235829 has 2 divisors, whose sum is σ = 81235830. Its totient is φ = 81235828.

The previous prime is 81235789. The next prime is 81235837. The reversal of 81235829 is 92853218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61858225 + 19377604 = 7865^2 + 4402^2 .

It is a cyclic number.

It is not a de Polignac number, because 81235829 - 2¹⁶ = 81170293 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 81235792 and 81235801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81235859) 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, 40617914 + 40617915.

It is an arithmetic number, because the mean of its divisors is an integer number (40617915).

Almost surely, 2^81235829 is an apocalyptic number.

It is an amenable number.

81235829 is a deficient number, since it is larger than the sum of its proper divisors (1).

81235829 is an equidigital number, since it uses as much as digits as its factorization.

81235829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 38.

The square root of 81235829 is about 9013.0920887340. The cubic root of 81235829 is about 433.0943707462.

It can be divided in two parts, 81235 and 829, that multiplied together give a triangular number (67343815 = T₁₁₆₀₅).

The spelling of 81235829 in words is "eighty-one million, two hundred thirty-five thousand, eight hundred twenty-nine".