81081003 has 16 divisors (see below), whose sum is σ = 113817600. Its totient is φ = 51241344.

The previous prime is 81081001. The next prime is 81081019. The reversal of 81081003 is 30018018.

It is a happy number.

It is not a de Polignac number, because 81081003 - 2¹ = 81081001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81081001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2598 + ... + 12996.

It is an arithmetic number, because the mean of its divisors is an integer number (7113600).

Almost surely, 2^81081003 is an apocalyptic number.

81081003 is a deficient number, since it is larger than the sum of its proper divisors (32736597).

81081003 is a wasteful number, since it uses less digits than its factorization.

81081003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10538.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 81081003 is about 9004.4990421455. The cubic root of 81081003 is about 432.8190533391.

The spelling of 81081003 in words is "eighty-one million, eighty-one thousand, three".