1243506223 has 2 divisors, whose sum is σ = 1243506224. Its totient is φ = 1243506222.

The previous prime is 1243506221. The next prime is 1243506269. The reversal of 1243506223 is 3226053421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1243506223 - 2¹ = 1243506221 is a prime.

Together with 1243506221, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1243506191 and 1243506200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243506221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621753111 + 621753112.

It is an arithmetic number, because the mean of its divisors is an integer number (621753112).

Almost surely, 2^1243506223 is an apocalyptic number.

1243506223 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243506223 is an equidigital number, since it uses as much as digits as its factorization.

1243506223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 1243506223 is about 35263.3836011237. The cubic root of 1243506223 is about 1075.3487162900.

Adding to 1243506223 its reverse (3226053421), we get a palindrome (4469559644).

The spelling of 1243506223 in words is "one billion, two hundred forty-three million, five hundred six thousand, two hundred twenty-three".