243443631 has 4 divisors (see below), whose sum is σ = 324591512. Its totient is φ = 162295752.

The previous prime is 243443623. The next prime is 243443639. The reversal of 243443631 is 136344342.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (243443623) and next prime (243443639).

It is not a de Polignac number, because 243443631 - 2³ = 243443623 is a prime.

It is a super-2 number, since 2×243443631² = 118529602948928322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243443639) 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, 40573936 + ... + 40573941.

It is an arithmetic number, because the mean of its divisors is an integer number (81147878).

Almost surely, 2^243443631 is an apocalyptic number.

243443631 is a deficient number, since it is larger than the sum of its proper divisors (81147881).

243443631 is an equidigital number, since it uses as much as digits as its factorization.

243443631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81147880.

The product of its digits is 20736, while the sum is 30.

The square root of 243443631 is about 15602.6802505211. The cubic root of 243443631 is about 624.4046648885.

Adding to 243443631 its reverse (136344342), we get a palindrome (379787973).

The spelling of 243443631 in words is "two hundred forty-three million, four hundred forty-three thousand, six hundred thirty-one".