1903685521103 has 4 divisors (see below), whose sum is σ = 1903688456280. Its totient is φ = 1903682585928.

The previous prime is 1903685521081. The next prime is 1903685521121. The reversal of 1903685521103 is 3011255863091.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1903685521103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1903685521603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16400 + ... + 1951317.

It is an arithmetic number, because the mean of its divisors is an integer number (475922114070).

Almost surely, 2^{1903685521103} is an apocalyptic number.

1903685521103 is a deficient number, since it is larger than the sum of its proper divisors (2935177).

1903685521103 is an equidigital number, since it uses as much as digits as its factorization.

1903685521103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2935176.

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 1903685521103 in words is "one trillion, nine hundred three billion, six hundred eighty-five million, five hundred twenty-one thousand, one hundred three".