231634213506 has 12 divisors (see below), whose sum is σ = 501874129302. Its totient is φ = 77211404496.

The previous prime is 231634213453. The next prime is 231634213523. The reversal of 231634213506 is 605312436132.

231634213506 is a `hidden beast` number, since 2 + 3 + 1 + 634 + 2 + 13 + 5 + 0 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 163430190225 + 68204023281 = 404265^2 + 261159^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6434283691 + ... + 6434283726.

Almost surely, 2^231634213506 is an apocalyptic number.

231634213506 is an abundant number, since it is smaller than the sum of its proper divisors (270239915796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231634213506 is a wasteful number, since it uses less digits than its factorization.

231634213506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12868567425 (or 12868567422 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

Adding to 231634213506 its reverse (605312436132), we get a palindrome (836946649638).

The spelling of 231634213506 in words is "two hundred thirty-one billion, six hundred thirty-four million, two hundred thirteen thousand, five hundred six".