3103045721 has 4 divisors (see below), whose sum is σ = 3103157412. Its totient is φ = 3102934032.

The previous prime is 3103045607. The next prime is 3103045723. The reversal of 3103045721 is 1275403013.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1275403013 = 15401 ⋅82813.

It can be written as a sum of positive squares in 2 ways, for example, as 1079845321 + 2023200400 = 32861^2 + 44980^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3103045721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3103045723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21995 + ... + 81791.

It is an arithmetic number, because the mean of its divisors is an integer number (775789353).

Almost surely, 2^3103045721 is an apocalyptic number.

It is an amenable number.

3103045721 is a deficient number, since it is larger than the sum of its proper divisors (111691).

3103045721 is an equidigital number, since it uses as much as digits as its factorization.

3103045721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111690.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 3103045721 is about 55704.9882954839. The cubic root of 3103045721 is about 1458.5771026414.

Adding to 3103045721 its reverse (1275403013), we get a palindrome (4378448734).

The spelling of 3103045721 in words is "three billion, one hundred three million, forty-five thousand, seven hundred twenty-one".