181813103 has 2 divisors, whose sum is σ = 181813104. Its totient is φ = 181813102.

The previous prime is 181813097. The next prime is 181813117. The reversal of 181813103 is 301318181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 181813103 - 2⁶ = 181813039 is a prime.

It is a super-3 number, since 3×181813103³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181813703) 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 as a sum of consecutive naturals, namely, 90906551 + 90906552.

It is an arithmetic number, because the mean of its divisors is an integer number (90906552).

Almost surely, 2^181813103 is an apocalyptic number.

181813103 is a deficient number, since it is larger than the sum of its proper divisors (1).

181813103 is an equidigital number, since it uses as much as digits as its factorization.

181813103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 181813103 is about 13483.8089203311. The cubic root of 181813103 is about 566.5110599656.

The spelling of 181813103 in words is "one hundred eighty-one million, eight hundred thirteen thousand, one hundred three".