243123453499 has 2 divisors, whose sum is σ = 243123453500. Its totient is φ = 243123453498.

The previous prime is 243123453493. The next prime is 243123453511. The reversal of 243123453499 is 994354321342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243123453499 - 2¹³ = 243123445307 is a prime.

It is not a weakly prime, because it can be changed into another prime (243123453493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121561726749 + 121561726750.

It is an arithmetic number, because the mean of its divisors is an integer number (121561726750).

Almost surely, 2^243123453499 is an apocalyptic number.

243123453499 is a deficient number, since it is larger than the sum of its proper divisors (1).

243123453499 is an equidigital number, since it uses as much as digits as its factorization.

243123453499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2799360, while the sum is 49.

The spelling of 243123453499 in words is "two hundred forty-three billion, one hundred twenty-three million, four hundred fifty-three thousand, four hundred ninety-nine".