81682429 has 2 divisors, whose sum is σ = 81682430. Its totient is φ = 81682428.

The previous prime is 81682423. The next prime is 81682441. The reversal of 81682429 is 92428618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65642404 + 16040025 = 8102^2 + 4005^2 .

It is a cyclic number.

It is not a de Polignac number, because 81682429 - 2⁷ = 81682301 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 81682391 and 81682400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81682423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40841214 + 40841215.

It is an arithmetic number, because the mean of its divisors is an integer number (40841215).

Almost surely, 2^81682429 is an apocalyptic number.

It is an amenable number.

81682429 is a deficient number, since it is larger than the sum of its proper divisors (1).

81682429 is an equidigital number, since it uses as much as digits as its factorization.

81682429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 40.

The square root of 81682429 is about 9037.8332027096. The cubic root of 81682429 is about 433.8865769279.

The spelling of 81682429 in words is "eighty-one million, six hundred eighty-two thousand, four hundred twenty-nine".