243400040431 has 4 divisors (see below), whose sum is σ = 245674807272. Its totient is φ = 241125273592.

The previous prime is 243400040413. The next prime is 243400040483. The reversal of 243400040431 is 134040004342.

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 243400040431 - 2¹¹ = 243400038383 is a prime.

It is a super-2 number, since 2×243400040431² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243400040396 and 243400040405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243400043431) 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, 1137383260 + ... + 1137383473.

It is an arithmetic number, because the mean of its divisors is an integer number (61418701818).

Almost surely, 2^243400040431 is an apocalyptic number.

243400040431 is a deficient number, since it is larger than the sum of its proper divisors (2274766841).

243400040431 is a wasteful number, since it uses less digits than its factorization.

243400040431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2274766840.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 243400040431 its reverse (134040004342), we get a palindrome (377440044773).

The spelling of 243400040431 in words is "two hundred forty-three billion, four hundred million, forty thousand, four hundred thirty-one".