81012143 has 8 divisors (see below), whose sum is σ = 86886000. Its totient is φ = 75299328.

The previous prime is 81012137. The next prime is 81012163. The reversal of 81012143 is 34121018.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81012143 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81012163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39218 + ... + 41231.

It is an arithmetic number, because the mean of its divisors is an integer number (10860750).

Almost surely, 2^81012143 is an apocalyptic number.

81012143 is a deficient number, since it is larger than the sum of its proper divisors (5873857).

81012143 is a wasteful number, since it uses less digits than its factorization.

81012143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80521.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 81012143 is about 9000.6745858297. The cubic root of 81012143 is about 432.6964912915.

The spelling of 81012143 in words is "eighty-one million, twelve thousand, one hundred forty-three".