243799814381 has 2 divisors, whose sum is σ = 243799814382. Its totient is φ = 243799814380.

The previous prime is 243799814317. The next prime is 243799814389. The reversal of 243799814381 is 183418997342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231033074281 + 12766740100 = 480659^2 + 112990^2 .

It is a cyclic number.

It is not a de Polignac number, because 243799814381 - 2⁶ = 243799814317 is a prime.

It is a super-2 number, since 2×243799814381² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 243799814381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243799814389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121899907190 + 121899907191.

It is an arithmetic number, because the mean of its divisors is an integer number (121899907191).

Almost surely, 2^243799814381 is an apocalyptic number.

It is an amenable number.

243799814381 is a deficient number, since it is larger than the sum of its proper divisors (1).

243799814381 is an equidigital number, since it uses as much as digits as its factorization.

243799814381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10450944, while the sum is 59.

The spelling of 243799814381 in words is "two hundred forty-three billion, seven hundred ninety-nine million, eight hundred fourteen thousand, three hundred eighty-one".