243013631 has 4 divisors (see below), whose sum is σ = 277729872. Its totient is φ = 208297392.

The previous prime is 243013609. The next prime is 243013637. The reversal of 243013631 is 136310342.

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 243013631 - 2²⁶ = 175904767 is a prime.

It is a super-2 number, since 2×243013631² = 118111249703608322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 243013597 and 243013606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243013637) 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, 17358110 + ... + 17358123.

It is an arithmetic number, because the mean of its divisors is an integer number (69432468).

Almost surely, 2^243013631 is an apocalyptic number.

243013631 is a deficient number, since it is larger than the sum of its proper divisors (34716241).

243013631 is an equidigital number, since it uses as much as digits as its factorization.

243013631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34716240.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 243013631 is about 15588.8944765176. The cubic root of 243013631 is about 624.0368148548.

Adding to 243013631 its reverse (136310342), we get a palindrome (379323973).

It can be divided in two parts, 2430 and 13631, that added together give a palindrome (16061).

The spelling of 243013631 in words is "two hundred forty-three million, thirteen thousand, six hundred thirty-one".