243288254491 has 2 divisors, whose sum is σ = 243288254492. Its totient is φ = 243288254490.

The previous prime is 243288254453. The next prime is 243288254519. The reversal of 243288254491 is 194452882342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243288254491 - 2¹¹ = 243288252443 is a prime.

It is not a weakly prime, because it can be changed into another prime (243288254291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121644127245 + 121644127246.

It is an arithmetic number, because the mean of its divisors is an integer number (121644127246).

Almost surely, 2^243288254491 is an apocalyptic number.

243288254491 is a deficient number, since it is larger than the sum of its proper divisors (1).

243288254491 is an equidigital number, since it uses as much as digits as its factorization.

243288254491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4423680, while the sum is 52.

The spelling of 243288254491 in words is "two hundred forty-three billion, two hundred eighty-eight million, two hundred fifty-four thousand, four hundred ninety-one".