243431423425 has 24 divisors (see below), whose sum is σ = 307673292024. Its totient is φ = 190994319360.

The previous prime is 243431423423. The next prime is 243431423533. The reversal of 243431423425 is 524324134342.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 5630851521 + 237800571904 = 75039^2 + 487648^2 .

It is not a de Polignac number, because 243431423425 - 2¹ = 243431423423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243431423423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3400299 + ... + 3471151.

It is an arithmetic number, because the mean of its divisors is an integer number (12819720501).

Almost surely, 2^243431423425 is an apocalyptic number.

243431423425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

243431423425 is a deficient number, since it is larger than the sum of its proper divisors (64241868599).

243431423425 is a wasteful number, since it uses less digits than its factorization.

243431423425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73509 (or 73504 counting only the distinct ones).

The product of its digits is 276480, while the sum is 37.

Adding to 243431423425 its reverse (524324134342), we get a palindrome (767755557767).

The spelling of 243431423425 in words is "two hundred forty-three billion, four hundred thirty-one million, four hundred twenty-three thousand, four hundred twenty-five".