1223721503 has 2 divisors, whose sum is σ = 1223721504. Its totient is φ = 1223721502.

The previous prime is 1223721487. The next prime is 1223721533. The reversal of 1223721503 is 3051273221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1223721503 - 2⁴ = 1223721487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223721533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611860751 + 611860752.

It is an arithmetic number, because the mean of its divisors is an integer number (611860752).

Almost surely, 2^1223721503 is an apocalyptic number.

1223721503 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223721503 is an equidigital number, since it uses as much as digits as its factorization.

1223721503 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1223721503 is about 34981.7309891892. The cubic root of 1223721503 is about 1069.6151126833.

Adding to 1223721503 its reverse (3051273221), we get a palindrome (4274994724).

The spelling of 1223721503 in words is "one billion, two hundred twenty-three million, seven hundred twenty-one thousand, five hundred three".