243407928422381 has 2 divisors, whose sum is σ = 243407928422382. Its totient is φ = 243407928422380.

The previous prime is 243407928422377. The next prime is 243407928422429. The reversal of 243407928422381 is 183224829704342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 226059945384100 + 17347983038281 = 15035290^2 + 4165091^2 .

It is a cyclic number.

It is not a de Polignac number, because 243407928422381 - 2² = 243407928422377 is a prime.

It is a super-2 number, since 2×243407928422381² (a number of 30 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 243407928422381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243407928022381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121703964211190 + 121703964211191.

It is an arithmetic number, because the mean of its divisors is an integer number (121703964211191).

Almost surely, 2^{243407928422381} is an apocalyptic number.

It is an amenable number.

243407928422381 is a deficient number, since it is larger than the sum of its proper divisors (1).

243407928422381 is an equidigital number, since it uses as much as digits as its factorization.

243407928422381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37158912, while the sum is 59.

The spelling of 243407928422381 in words is "two hundred forty-three trillion, four hundred seven billion, nine hundred twenty-eight million, four hundred twenty-two thousand, three hundred eighty-one".