100603 has 4 divisors (see below), whose sum is σ = 103360. Its totient is φ = 97848.

The previous prime is 100591. The next prime is 100609. The reversal of 100603 is 306001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 306001 = 31 ⋅9871.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100603 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 100603.

It is not an unprimeable number, because it can be changed into a prime (100609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1323 + ... + 1396.

It is an arithmetic number, because the mean of its divisors is an integer number (25840).

2¹⁰⁰⁶⁰³ is an apocalyptic number.

100603 is a deficient number, since it is larger than the sum of its proper divisors (2757).

100603 is an equidigital number, since it uses as much as digits as its factorization.

100603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2756.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 100603 is about 317.1797597578. The cubic root of 100603 is about 46.5089973725.

Adding to 100603 its reverse (306001), we get a palindrome (406604).

It can be divided in two parts, 100 and 603, that added together give a triangular number (703 = T₃₇).

The spelling of 100603 in words is "one hundred thousand, six hundred three".