243400324457 has 2 divisors, whose sum is σ = 243400324458. Its totient is φ = 243400324456.

The previous prime is 243400324411. The next prime is 243400324463. The reversal of 243400324457 is 754423004342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243242294416 + 158030041 = 493196^2 + 12571^2 .

It is a cyclic number.

It is not a de Polignac number, because 243400324457 - 2²⁴ = 243383547241 is a prime.

It is a super-5 number, since 5×243400324457⁵ (a number of 58 digits) contains 55555 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 243400324457.

It is not a weakly prime, because it can be changed into another prime (243400324487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121700162228 + 121700162229.

It is an arithmetic number, because the mean of its divisors is an integer number (121700162229).

Almost surely, 2^243400324457 is an apocalyptic number.

It is an amenable number.

243400324457 is a deficient number, since it is larger than the sum of its proper divisors (1).

243400324457 is an equidigital number, since it uses as much as digits as its factorization.

243400324457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 322560, while the sum is 38.

Adding to 243400324457 its reverse (754423004342), we get a palindrome (997823328799).

The spelling of 243400324457 in words is "two hundred forty-three billion, four hundred million, three hundred twenty-four thousand, four hundred fifty-seven".