243042995969 has 2 divisors, whose sum is σ = 243042995970. Its totient is φ = 243042995968.

The previous prime is 243042995947. The next prime is 243042995999. The reversal of 243042995969 is 969599240342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155009138944 + 88033857025 = 393712^2 + 296705^2 .

It is a cyclic number.

It is not a de Polignac number, because 243042995969 - 2¹⁶ = 243042930433 is a prime.

It is a super-2 number, since 2×243042995969² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (243042995999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121521497984 + 121521497985.

It is an arithmetic number, because the mean of its divisors is an integer number (121521497985).

Almost surely, 2^243042995969 is an apocalyptic number.

It is an amenable number.

243042995969 is a deficient number, since it is larger than the sum of its proper divisors (1).

243042995969 is an equidigital number, since it uses as much as digits as its factorization.

243042995969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37791360, while the sum is 62.

The spelling of 243042995969 in words is "two hundred forty-three billion, forty-two million, nine hundred ninety-five thousand, nine hundred sixty-nine".