243431541 has 24 divisors (see below), whose sum is σ = 366799680. Its totient is φ = 159561360.

The previous prime is 243431533. The next prime is 243431543. The reversal of 243431541 is 145134342.

It is a happy number.

243431541 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 243431541 - 2³ = 243431533 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243431543) 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, 99256 + ... + 101678.

It is an arithmetic number, because the mean of its divisors is an integer number (15283320).

Almost surely, 2^243431541 is an apocalyptic number.

It is an amenable number.

243431541 is a deficient number, since it is larger than the sum of its proper divisors (123368139).

243431541 is an equidigital number, since it uses as much as digits as its factorization.

243431541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2554 (or 2487 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 243431541 is about 15602.2928122760. The cubic root of 243431541 is about 624.3943282350.

Adding to 243431541 its reverse (145134342), we get a palindrome (388565883).

The spelling of 243431541 in words is "two hundred forty-three million, four hundred thirty-one thousand, five hundred forty-one".