243631613631 has 16 divisors (see below), whose sum is σ = 373171745024. Its totient is φ = 138496725504.

The previous prime is 243631613623. The next prime is 243631613651. The reversal of 243631613631 is 136316136342.

It is a happy number.

It is not a de Polignac number, because 243631613631 - 2³ = 243631613623 is a prime.

It is a super-2 number, since 2×243631613631² (a number of 24 digits) 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 243631613631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243631613611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30051661 + ... + 30059766.

It is an arithmetic number, because the mean of its divisors is an integer number (23323234064).

Almost surely, 2^243631613631 is an apocalyptic number.

243631613631 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

243631613631 is a deficient number, since it is larger than the sum of its proper divisors (129540131393).

243631613631 is a wasteful number, since it uses less digits than its factorization.

243631613631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60111630.

The product of its digits is 139968, while the sum is 39.

Adding to 243631613631 its reverse (136316136342), we get a palindrome (379947749973).

The spelling of 243631613631 in words is "two hundred forty-three billion, six hundred thirty-one million, six hundred thirteen thousand, six hundred thirty-one".