243121249447 has 2 divisors, whose sum is σ = 243121249448. Its totient is φ = 243121249446.

The previous prime is 243121249409. The next prime is 243121249517. The reversal of 243121249447 is 744942121342.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243121249447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243121243447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560624723 + 121560624724.

It is an arithmetic number, because the mean of its divisors is an integer number (121560624724).

Almost surely, 2^243121249447 is an apocalyptic number.

243121249447 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121249447 is an equidigital number, since it uses as much as digits as its factorization.

243121249447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 43.

The spelling of 243121249447 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-nine thousand, four hundred forty-seven".