243403444451 has 2 divisors, whose sum is σ = 243403444452. Its totient is φ = 243403444450.

The previous prime is 243403444447. The next prime is 243403444481. The reversal of 243403444451 is 154444304342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243403444451 - 2² = 243403444447 is a prime.

It is a super-2 number, since 2×243403444451² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243403444481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121701722225 + 121701722226.

It is an arithmetic number, because the mean of its divisors is an integer number (121701722226).

Almost surely, 2^243403444451 is an apocalyptic number.

243403444451 is a deficient number, since it is larger than the sum of its proper divisors (1).

243403444451 is an equidigital number, since it uses as much as digits as its factorization.

243403444451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 368640, while the sum is 38.

Adding to 243403444451 its reverse (154444304342), we get a palindrome (397847748793).

The spelling of 243403444451 in words is "two hundred forty-three billion, four hundred three million, four hundred forty-four thousand, four hundred fifty-one".