81429683 has 4 divisors (see below), whose sum is σ = 84970128. Its totient is φ = 77889240.

The previous prime is 81429613. The next prime is 81429707. The reversal of 81429683 is 38692418.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38692418 = 2 ⋅19346209.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81429683 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81429683.

It is not an unprimeable number, because it can be changed into a prime (81429613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1770188 + ... + 1770233.

It is an arithmetic number, because the mean of its divisors is an integer number (21242532).

Almost surely, 2^81429683 is an apocalyptic number.

81429683 is a deficient number, since it is larger than the sum of its proper divisors (3540445).

81429683 is a wasteful number, since it uses less digits than its factorization.

81429683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3540444.

The product of its digits is 82944, while the sum is 41.

The square root of 81429683 is about 9023.8397038068. The cubic root of 81429683 is about 433.4385964529.

The spelling of 81429683 in words is "eighty-one million, four hundred twenty-nine thousand, six hundred eighty-three".