1331605103 has 4 divisors (see below), whose sum is σ = 1340542200. Its totient is φ = 1322668008.

The previous prime is 1331605097. The next prime is 1331605129. The reversal of 1331605103 is 3015061331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3015061331 = 1409 ⋅2139859.

It is a cyclic number.

It is not a de Polignac number, because 1331605103 - 2¹⁸ = 1331342959 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 (1331605193) 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, 4468325 + ... + 4468622.

It is an arithmetic number, because the mean of its divisors is an integer number (335135550).

Almost surely, 2^1331605103 is an apocalyptic number.

1331605103 is a deficient number, since it is larger than the sum of its proper divisors (8937097).

1331605103 is an equidigital number, since it uses as much as digits as its factorization.

1331605103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8937096.

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 1331605103 is about 36491.1647251770. The cubic root of 1331605103 is about 1100.1666697866.

Adding to 1331605103 its reverse (3015061331), we get a palindrome (4346666434).

The spelling of 1331605103 in words is "one billion, three hundred thirty-one million, six hundred five thousand, one hundred three".