100203645 has 16 divisors (see below), whose sum is σ = 160456320. Its totient is φ = 53398464.

The previous prime is 100203637. The next prime is 100203647. The reversal of 100203645 is 546302001.

It is a happy number.

It is not a de Polignac number, because 100203645 - 2³ = 100203637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100203647) 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 in 15 ways as a sum of consecutive naturals, for example, 26376 + ... + 29934.

It is an arithmetic number, because the mean of its divisors is an integer number (10028520).

Almost surely, 2^100203645 is an apocalyptic number.

100203645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

100203645 is a deficient number, since it is larger than the sum of its proper divisors (60252675).

100203645 is a wasteful number, since it uses less digits than its factorization.

100203645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5444.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 100203645 is about 10010.1770713609. The cubic root of 100203645 is about 464.4737485082.

Adding to 100203645 its reverse (546302001), we get a palindrome (646505646).

The spelling of 100203645 in words is "one hundred million, two hundred three thousand, six hundred forty-five".