231531421241205 has 12 divisors (see below), whose sum is σ = 401321130151500. Its totient is φ = 123483424661952.

The previous prime is 231531421241101. The next prime is 231531421241209. The reversal of 231531421241205 is 502142124135132.

231531421241205 is a `hidden beast` number, since 2 + 3 + 1 + 5 + 3 + 1 + 421 + 24 + 1 + 205 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 91513827833796 + 140017593407409 = 9566286^2 + 11832903^2 .

It is not a de Polignac number, because 231531421241205 - 2²⁶ = 231531354132341 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231531421241205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231531421241209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2572571347080 + ... + 2572571347169.

It is an arithmetic number, because the mean of its divisors is an integer number (33443427512625).

Almost surely, 2^{231531421241205} is an apocalyptic number.

It is an amenable number.

231531421241205 is a deficient number, since it is larger than the sum of its proper divisors (169789708910295).

231531421241205 is a wasteful number, since it uses less digits than its factorization.

231531421241205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5145142694260 (or 5145142694257 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

Adding to 231531421241205 its reverse (502142124135132), we get a palindrome (733673545376337).

The spelling of 231531421241205 in words is "two hundred thirty-one trillion, five hundred thirty-one billion, four hundred twenty-one million, two hundred forty-one thousand, two hundred five".