243105605531 has 2 divisors, whose sum is σ = 243105605532. Its totient is φ = 243105605530.

The previous prime is 243105605503. The next prime is 243105605557. The reversal of 243105605531 is 135506501342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243105605531 - 2⁶ = 243105605467 is a prime.

It is a super-2 number, since 2×243105605531² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 243105605491 and 243105605500.

It is not a weakly prime, because it can be changed into another prime (243105605581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121552802765 + 121552802766.

It is an arithmetic number, because the mean of its divisors is an integer number (121552802766).

Almost surely, 2^243105605531 is an apocalyptic number.

243105605531 is a deficient number, since it is larger than the sum of its proper divisors (1).

243105605531 is an equidigital number, since it uses as much as digits as its factorization.

243105605531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54000, while the sum is 35.

The spelling of 243105605531 in words is "two hundred forty-three billion, one hundred five million, six hundred five thousand, five hundred thirty-one".