100003 has 2 divisors, whose sum is σ = 100004. Its totient is φ = 100002.

The previous prime is 99991. The next prime is 100019. The reversal of 100003 is 300001.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 100003 - 2⁵ = 99971 is a prime.

100003 is a modest number, since divided by 3 gives 1 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 99965 and 100001.

It is not a weakly prime, because it can be changed into another prime (100043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50001 + 50002.

It is an arithmetic number, because the mean of its divisors is an integer number (50002).

2¹⁰⁰⁰⁰³ is an apocalyptic number.

100003 is a deficient number, since it is larger than the sum of its proper divisors (1).

100003 is an equidigital number, since it uses as much as digits as its factorization.

100003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3, while the sum is 4.

The square root of 100003 is about 316.2325093978. The cubic root of 100003 is about 46.4163524904.

Adding to 100003 its reverse (300001), we get a palindrome (400004).

The spelling of 100003 in words is "one hundred thousand, three", and thus it is an iban number.