231109162128 has 480 divisors, whose sum is σ = 747777139200. Its totient is φ = 66042003456.

The previous prime is 231109162121. The next prime is 231109162133. The reversal of 231109162128 is 821261901132.

231109162128 is a `hidden beast` number, since 2 + 3 + 1 + 1 + 0 + 9 + 1 + 621 + 28 = 666.

It is a super-2 number, since 2×231109162128² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 231109162092 and 231109162101.

It is not an unprimeable number, because it can be changed into a prime (231109162121) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 654700000 + ... + 654700352.

It is an arithmetic number, because the mean of its divisors is an integer number (1557869040).

Almost surely, 2^231109162128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231109162128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (373888569600).

231109162128 is an abundant number, since it is smaller than the sum of its proper divisors (516667977072).

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

231109162128 is a wasteful number, since it uses less digits than its factorization.

231109162128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711 (or 702 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The spelling of 231109162128 in words is "two hundred thirty-one billion, one hundred nine million, one hundred sixty-two thousand, one hundred twenty-eight".