243431445431 has 4 divisors (see below), whose sum is σ = 245841657864. Its totient is φ = 241021233000.

The previous prime is 243431445419. The next prime is 243431445437. The reversal of 243431445431 is 134544134342.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 243431445431 - 2²² = 243427251127 is a prime.

It is a super-2 number, since 2×243431445431² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243431445437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1205106065 + ... + 1205106266.

It is an arithmetic number, because the mean of its divisors is an integer number (61460414466).

Almost surely, 2^243431445431 is an apocalyptic number.

243431445431 is a deficient number, since it is larger than the sum of its proper divisors (2410212433).

243431445431 is a wasteful number, since it uses less digits than its factorization.

243431445431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2410212432.

The product of its digits is 276480, while the sum is 38.

Adding to 243431445431 its reverse (134544134342), we get a palindrome (377975579773).

The spelling of 243431445431 in words is "two hundred forty-three billion, four hundred thirty-one million, four hundred forty-five thousand, four hundred thirty-one".