243431505 has 12 divisors (see below), whose sum is σ = 421948020. Its totient is φ = 129830112.

The previous prime is 243431501. The next prime is 243431509. The reversal of 243431505 is 505134342.

It is an interprime number because it is at equal distance from previous prime (243431501) and next prime (243431509).

It can be written as a sum of positive squares in 2 ways, for example, as 49999041 + 193432464 = 7071^2 + 13908^2 .

It is not a de Polignac number, because 243431505 - 2² = 243431501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243431501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2704750 + ... + 2704839.

It is an arithmetic number, because the mean of its divisors is an integer number (35162335).

Almost surely, 2^243431505 is an apocalyptic number.

It is an amenable number.

243431505 is a deficient number, since it is larger than the sum of its proper divisors (178516515).

243431505 is a wasteful number, since it uses less digits than its factorization.

243431505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5409600 (or 5409597 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 243431505 is about 15602.2916585994. The cubic root of 243431505 is about 624.3942974554.

Adding to 243431505 its reverse (505134342), we get a palindrome (748565847).

The spelling of 243431505 in words is "two hundred forty-three million, four hundred thirty-one thousand, five hundred five".