243434131 has 4 divisors (see below), whose sum is σ = 244132000. Its totient is φ = 242736264.

The previous prime is 243434129. The next prime is 243434153. The reversal of 243434131 is 131434342.

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 243434131 - 2¹ = 243434129 is a prime.

It is a super-2 number, since 2×243434131² = 118520352271450322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243434096 and 243434105.

It is not an unprimeable number, because it can be changed into a prime (243434161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348411 + ... + 349108.

It is an arithmetic number, because the mean of its divisors is an integer number (61033000).

Almost surely, 2^243434131 is an apocalyptic number.

243434131 is a deficient number, since it is larger than the sum of its proper divisors (697869).

243434131 is an equidigital number, since it uses as much as digits as its factorization.

243434131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697868.

The product of its digits is 3456, while the sum is 25.

The square root of 243434131 is about 15602.3758126767. The cubic root of 243434131 is about 624.3965426503.

Adding to 243434131 its reverse (131434342), we get a palindrome (374868473).

The spelling of 243434131 in words is "two hundred forty-three million, four hundred thirty-four thousand, one hundred thirty-one".