243315631 has 8 divisors (see below), whose sum is σ = 262340064. Its totient is φ = 224335200.

The previous prime is 243315581. The next prime is 243315637. The reversal of 243315631 is 136513342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243315631 - 2⁹ = 243315119 is a prime.

It is a super-2 number, since 2×243315631² = 118404992577856322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243315631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243315637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 981 + ... + 22081.

It is an arithmetic number, because the mean of its divisors is an integer number (32792508).

Almost surely, 2^243315631 is an apocalyptic number.

243315631 is a deficient number, since it is larger than the sum of its proper divisors (19024433).

243315631 is a wasteful number, since it uses less digits than its factorization.

243315631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22001.

The product of its digits is 6480, while the sum is 28.

The square root of 243315631 is about 15598.5778518428. The cubic root of 243315631 is about 624.2952106539.

Adding to 243315631 its reverse (136513342), we get a palindrome (379828973).

The spelling of 243315631 in words is "two hundred forty-three million, three hundred fifteen thousand, six hundred thirty-one".