243385957431 has 12 divisors (see below), whose sum is σ = 355507579440. Its totient is φ = 160434188640.

The previous prime is 243385957417. The next prime is 243385957447. The reversal of 243385957431 is 134759583342.

243385957431 is a `hidden beast` number, since 2 + 4 + 3 + 3 + 8 + 595 + 7 + 43 + 1 = 666.

It is not a de Polignac number, because 243385957431 - 2²⁵ = 243352402999 is a prime.

It is a super-2 number, since 2×243385957431² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243385957471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 151925515 + ... + 151927116.

It is an arithmetic number, because the mean of its divisors is an integer number (29625631620).

Almost surely, 2^243385957431 is an apocalyptic number.

243385957431 is a deficient number, since it is larger than the sum of its proper divisors (112121622009).

243385957431 is a wasteful number, since it uses less digits than its factorization.

243385957431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303852726 (or 303852723 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 54.

The spelling of 243385957431 in words is "two hundred forty-three billion, three hundred eighty-five million, nine hundred fifty-seven thousand, four hundred thirty-one".