231086428 has 12 divisors (see below), whose sum is σ = 421984080. Its totient is φ = 110519552.

The previous prime is 231086407. The next prime is 231086437. The reversal of 231086428 is 824680132.

231086428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 231086393 and 231086402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1255813 + ... + 1255996.

It is an arithmetic number, because the mean of its divisors is an integer number (35165340).

Almost surely, 2^231086428 is an apocalyptic number.

It is an amenable number.

231086428 is a deficient number, since it is larger than the sum of its proper divisors (190897652).

231086428 is a wasteful number, since it uses less digits than its factorization.

231086428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2511836 (or 2511834 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 231086428 is about 15201.5271601244. The cubic root of 231086428 is about 613.6557574071.

The spelling of 231086428 in words is "two hundred thirty-one million, eighty-six thousand, four hundred twenty-eight".