81121112003 has 2 divisors, whose sum is σ = 81121112004. Its totient is φ = 81121112002.

The previous prime is 81121111997. The next prime is 81121112071. The reversal of 81121112003 is 30021112118.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81121112003 - 2¹⁶ = 81121046467 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (81121112203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40560556001 + 40560556002.

It is an arithmetic number, because the mean of its divisors is an integer number (40560556002).

Almost surely, 2^81121112003 is an apocalyptic number.

81121112003 is a deficient number, since it is larger than the sum of its proper divisors (1).

81121112003 is an equidigital number, since it uses as much as digits as its factorization.

81121112003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 20.

The spelling of 81121112003 in words is "eighty-one billion, one hundred twenty-one million, one hundred twelve thousand, three".