81130103 has 18 divisors (see below), whose sum is σ = 88865448. Its totient is φ = 74049280.

The previous prime is 81130097. The next prime is 81130129. The reversal of 81130103 is 30103118.

It is not a de Polignac number, because 81130103 - 2¹⁴ = 81113719 is a prime.

It is a super-2 number, since 2×81130103² = 13164187225581218, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81130163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 485726 + ... + 485892.

Almost surely, 2^81130103 is an apocalyptic number.

81130103 is a deficient number, since it is larger than the sum of its proper divisors (7735345).

81130103 is a wasteful number, since it uses less digits than its factorization.

81130103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283 (or 225 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 81130103 is about 9007.2250443741. The cubic root of 81130103 is about 432.9064027241.

The spelling of 81130103 in words is "eighty-one million, one hundred thirty thousand, one hundred three".