1243523023 has 4 divisors (see below), whose sum is σ = 1243765888. Its totient is φ = 1243280160.

The previous prime is 1243522993. The next prime is 1243523147. The reversal of 1243523023 is 3203253421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3203253421 = 21961 ⋅145861.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243523023 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 (1243523623) 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, 113583 + ... + 124048.

It is an arithmetic number, because the mean of its divisors is an integer number (310941472).

Almost surely, 2^1243523023 is an apocalyptic number.

1243523023 is a deficient number, since it is larger than the sum of its proper divisors (242865).

1243523023 is an equidigital number, since it uses as much as digits as its factorization.

1243523023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242864.

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 1243523023 is about 35263.6218077497. The cubic root of 1243523023 is about 1075.3535589884.

Adding to 1243523023 its reverse (3203253421), we get a palindrome (4446776444).

The spelling of 1243523023 in words is "one billion, two hundred forty-three million, five hundred twenty-three thousand, twenty-three".