231526836 has 120 divisors (see below), whose sum is σ = 642466440. Its totient is φ = 72576000.

The previous prime is 231526831. The next prime is 231526861. The reversal of 231526836 is 638625132.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 21566736 + 209960100 = 4644^2 + 14490^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 231526836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231526831) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 384936 + ... + 385536.

It is an arithmetic number, because the mean of its divisors is an integer number (5353887).

Almost surely, 2^231526836 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 231526836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321233220).

231526836 is an abundant number, since it is smaller than the sum of its proper divisors (410939604).

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

231526836 is a wasteful number, since it uses less digits than its factorization.

231526836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687 (or 676 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 231526836 is about 15216.0059148253. The cubic root of 231526836 is about 614.0453481486.

The spelling of 231526836 in words is "two hundred thirty-one million, five hundred twenty-six thousand, eight hundred thirty-six".