231904509111 has 30 divisors (see below), whose sum is σ = 380781494016. Its totient is φ = 140548181400.

The previous prime is 231904509107. The next prime is 231904509191. The reversal of 231904509111 is 111905409132.

231904509111 is a `hidden beast` number, since 2 + 3 + 1 + 90 + 450 + 9 + 111 = 666.

It is not a de Polignac number, because 231904509111 - 2² = 231904509107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231904509191) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 11820855 + ... + 11840456.

Almost surely, 2^231904509111 is an apocalyptic number.

231904509111 is a deficient number, since it is larger than the sum of its proper divisors (148876984905).

231904509111 is a wasteful number, since it uses less digits than its factorization.

231904509111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23661345 (or 23661325 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The spelling of 231904509111 in words is "two hundred thirty-one billion, nine hundred four million, five hundred nine thousand, one hundred eleven".