81429 has 4 divisors (see below), whose sum is σ = 108576. Its totient is φ = 54284.

The previous prime is 81421. The next prime is 81439. The reversal of 81429 is 92418.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81429 - 2³ = 81421 is a prime.

It is a D-number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81399 and 81408.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 81429.

It is not an unprimeable number, because it can be changed into a prime (81421) 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, 13569 + ... + 13574.

It is an arithmetic number, because the mean of its divisors is an integer number (27144).

2⁸¹⁴²⁹ is an apocalyptic number.

It is an amenable number.

81429 is a deficient number, since it is larger than the sum of its proper divisors (27147).

81429 is a wasteful number, since it uses less digits than its factorization.

81429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27146.

The product of its digits is 576, while the sum is 24.

The square root of 81429 is about 285.3576703017. The cubic root of 81429 is about 43.3437384612.

The spelling of 81429 in words is "eighty-one thousand, four hundred twenty-nine".