231135928 has 16 divisors (see below), whose sum is σ = 434612880. Its totient is φ = 115239168.

The previous prime is 231135923. The next prime is 231135953. The reversal of 231135928 is 829531132.

It is a junction number, because it is equal to n+sod(n) for n = 231135893 and 231135902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231135923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38100 + ... + 43747.

It is an arithmetic number, because the mean of its divisors is an integer number (27163305).

Almost surely, 2^231135928 is an apocalyptic number.

It is an amenable number.

231135928 is a deficient number, since it is larger than the sum of its proper divisors (203476952).

231135928 is a wasteful number, since it uses less digits than its factorization.

231135928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82206 (or 82202 counting only the distinct ones).

The product of its digits is 12960, while the sum is 34.

The square root of 231135928 is about 15203.1551988395. The cubic root of 231135928 is about 613.6995704393.

The spelling of 231135928 in words is "two hundred thirty-one million, one hundred thirty-five thousand, nine hundred twenty-eight".