81142003 has 4 divisors (see below), whose sum is σ = 85915080. Its totient is φ = 76368928.

The previous prime is 81142001. The next prime is 81142021. The reversal of 81142003 is 30024118.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81142003 - 2¹ = 81142001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81142001) 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, 2386513 + ... + 2386546.

It is an arithmetic number, because the mean of its divisors is an integer number (21478770).

Almost surely, 2^81142003 is an apocalyptic number.

81142003 is a deficient number, since it is larger than the sum of its proper divisors (4773077).

81142003 is a wasteful number, since it uses less digits than its factorization.

81142003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4773076.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 81142003 is about 9007.8856009610. The cubic root of 81142003 is about 432.9275676355.

The spelling of 81142003 in words is "eighty-one million, one hundred forty-two thousand, three".