243454513 has 2 divisors, whose sum is σ = 243454514. Its totient is φ = 243454512.

The previous prime is 243454511. The next prime is 243454531. The reversal of 243454513 is 315454342.

Together with next prime (243454531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148060224 + 95394289 = 12168^2 + 9767^2 .

It is a cyclic number.

It is not a de Polignac number, because 243454513 - 2¹ = 243454511 is a prime.

Together with 243454511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (243454511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121727256 + 121727257.

It is an arithmetic number, because the mean of its divisors is an integer number (121727257).

Almost surely, 2^243454513 is an apocalyptic number.

It is an amenable number.

243454513 is a deficient number, since it is larger than the sum of its proper divisors (1).

243454513 is an equidigital number, since it uses as much as digits as its factorization.

243454513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 31.

The square root of 243454513 is about 15603.0289687612. The cubic root of 243454513 is about 624.4139684390.

The spelling of 243454513 in words is "two hundred forty-three million, four hundred fifty-four thousand, five hundred thirteen".