231103661136 has 80 divisors (see below), whose sum is σ = 636014988864. Its totient is φ = 72058263552.

The previous prime is 231103661123. The next prime is 231103661137. The reversal of 231103661136 is 631166301132.

It is a junction number, because it is equal to n+sod(n) for n = 231103661097 and 231103661106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231103661137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 735751 + ... + 1001766.

Almost surely, 2^231103661136 is an apocalyptic number.

It is an amenable number.

231103661136 is an abundant number, since it is smaller than the sum of its proper divisors (404911327728).

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

231103661136 is a wasteful number, since it uses less digits than its factorization.

231103661136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737708 (or 1737702 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 33.

Adding to 231103661136 its reverse (631166301132), we get a palindrome (862269962268).

The spelling of 231103661136 in words is "two hundred thirty-one billion, one hundred three million, six hundred sixty-one thousand, one hundred thirty-six".