81387003 has 8 divisors (see below), whose sum is σ = 111039808. Its totient is φ = 52996104.

The previous prime is 81386999. The next prime is 81387049. The reversal of 81387003 is 30078318.

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

It is not a de Polignac number, because 81387003 - 2² = 81386999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81387083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 315325 + ... + 315582.

It is an arithmetic number, because the mean of its divisors is an integer number (13879976).

Almost surely, 2^81387003 is an apocalyptic number.

81387003 is a deficient number, since it is larger than the sum of its proper divisors (29652805).

81387003 is a wasteful number, since it uses less digits than its factorization.

81387003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630953.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 81387003 is about 9021.4745468798. The cubic root of 81387003 is about 433.3628566999.

The spelling of 81387003 in words is "eighty-one million, three hundred eighty-seven thousand, three".