243545431 has 4 divisors (see below), whose sum is σ = 244906200. Its totient is φ = 242184664.

The previous prime is 243545411. The next prime is 243545443. The reversal of 243545431 is 134545342.

243545431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134545342 = 2 ⋅67272671.

It is a cyclic number.

It is not a de Polignac number, because 243545431 - 2¹⁵ = 243512663 is a prime.

It is a super-3 number, since 3×243545431³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243545393 and 243545402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243545411) 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, 680116 + ... + 680473.

It is an arithmetic number, because the mean of its divisors is an integer number (61226550).

Almost surely, 2^243545431 is an apocalyptic number.

243545431 is a deficient number, since it is larger than the sum of its proper divisors (1360769).

243545431 is a wasteful number, since it uses less digits than its factorization.

243545431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360768.

The product of its digits is 28800, while the sum is 31.

The square root of 243545431 is about 15605.9421695712. The cubic root of 243545431 is about 624.4916878220.

The spelling of 243545431 in words is "two hundred forty-three million, five hundred forty-five thousand, four hundred thirty-one".