243474221605631 has 2 divisors, whose sum is σ = 243474221605632. Its totient is φ = 243474221605630.

The previous prime is 243474221605567. The next prime is 243474221605663. The reversal of 243474221605631 is 136506122474342.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243474221605631 - 2⁶ = 243474221605567 is a prime.

It is a super-2 number, since 2×243474221605631² (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 243474221605631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243474221604631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121737110802815 + 121737110802816.

It is an arithmetic number, because the mean of its divisors is an integer number (121737110802816).

Almost surely, 2^{243474221605631} is an apocalyptic number.

243474221605631 is a deficient number, since it is larger than the sum of its proper divisors (1).

243474221605631 is an equidigital number, since it uses as much as digits as its factorization.

243474221605631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5806080, while the sum is 50.

The spelling of 243474221605631 in words is "two hundred forty-three trillion, four hundred seventy-four billion, two hundred twenty-one million, six hundred five thousand, six hundred thirty-one".