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231231320 = 2355780783
BaseRepresentation
bin11011100100001…
…00111101011000
3121010002202201222
431302010331120
5433143400240
634540031212
75505301535
oct1562047530
9533082658
10231231320
11109584571
1265532508
1338ba0888
14229d1d8c
1515477eb5
hexdc84f58

231231320 has 16 divisors (see below), whose sum is σ = 520270560. Its totient is φ = 92492512.

The previous prime is 231231293. The next prime is 231231323. The reversal of 231231320 is 23132132.

231231320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231231323) 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, 2890352 + ... + 2890431.

It is an arithmetic number, because the mean of its divisors is an integer number (32516910).

Almost surely, 2231231320 is an apocalyptic number.

231231320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231231320 is an abundant number, since it is smaller than the sum of its proper divisors (289039240).

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

231231320 is a wasteful number, since it uses less digits than its factorization.

231231320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5780794 (or 5780790 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 231231320 is about 15206.2921187251. The cubic root of 231231320 is about 613.7839853810.

Adding to 231231320 its reverse (23132132), we get a palindrome (254363452).

The spelling of 231231320 in words is "two hundred thirty-one million, two hundred thirty-one thousand, three hundred twenty".

Divisors: 1 2 4 5 8 10 20 40 5780783 11561566 23123132 28903915 46246264 57807830 115615660 231231320