3123103721 has 2 divisors, whose sum is σ = 3123103722. Its totient is φ = 3123103720.

The previous prime is 3123103693. The next prime is 3123103723. The reversal of 3123103721 is 1273013213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2501100121 + 622003600 = 50011^2 + 24940^2 .

It is an emirp because it is prime and its reverse (1273013213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3123103721 - 2⁶ = 3123103657 is a prime.

Together with 3123103723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3123103723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1561551860 + 1561551861.

It is an arithmetic number, because the mean of its divisors is an integer number (1561551861).

Almost surely, 2^3123103721 is an apocalyptic number.

It is an amenable number.

3123103721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3123103721 is an equidigital number, since it uses as much as digits as its factorization.

3123103721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 3123103721 is about 55884.7360287225. The cubic root of 3123103721 is about 1461.7130890879.

Adding to 3123103721 its reverse (1273013213), we get a palindrome (4396116934).

The spelling of 3123103721 in words is "three billion, one hundred twenty-three million, one hundred three thousand, seven hundred twenty-one".