81744029 has 2 divisors, whose sum is σ = 81744030. Its totient is φ = 81744028.

The previous prime is 81743999. The next prime is 81744031. The reversal of 81744029 is 92044718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65983129 + 15760900 = 8123^2 + 3970^2 .

It is a cyclic number.

It is not a de Polignac number, because 81744029 - 2⁸ = 81743773 is a prime.

Together with 81744031, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81744029.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81744079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40872014 + 40872015.

It is an arithmetic number, because the mean of its divisors is an integer number (40872015).

Almost surely, 2^81744029 is an apocalyptic number.

It is an amenable number.

81744029 is a deficient number, since it is larger than the sum of its proper divisors (1).

81744029 is an equidigital number, since it uses as much as digits as its factorization.

81744029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 81744029 is about 9041.2404569285. The cubic root of 81744029 is about 433.9956199520.

The spelling of 81744029 in words is "eighty-one million, seven hundred forty-four thousand, twenty-nine".