81143827 has 8 divisors (see below), whose sum is σ = 84047040. Its totient is φ = 78247680.

The previous prime is 81143819. The next prime is 81143857. The reversal of 81143827 is 72834118.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81143827 - 2³ = 81143819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81143792 and 81143801.

It is not an unprimeable number, because it can be changed into a prime (81143857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34563 + ... + 36835.

It is an arithmetic number, because the mean of its divisors is an integer number (10505880).

Almost surely, 2^81143827 is an apocalyptic number.

81143827 is a deficient number, since it is larger than the sum of its proper divisors (2903213).

81143827 is a wasteful number, since it uses less digits than its factorization.

81143827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3533.

The product of its digits is 10752, while the sum is 34.

The square root of 81143827 is about 9007.9868450170. The cubic root of 81143827 is about 432.9308115533.

The spelling of 81143827 in words is "eighty-one million, one hundred forty-three thousand, eight hundred twenty-seven".