231081280 has 112 divisors (see below), whose sum is σ = 585490320. Its totient is φ = 86704128.

The previous prime is 231081247. The next prime is 231081283. The reversal of 231081280 is 82180132.

It can be written as a sum of positive squares in 8 ways, for example, as 1498176 + 229583104 = 1224^2 + 15152^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231081283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 343024 + ... + 343696.

Almost surely, 2^231081280 is an apocalyptic number.

231081280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231081280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (292745160).

231081280 is an abundant number, since it is smaller than the sum of its proper divisors (354409040).

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

231081280 is a wasteful number, since it uses less digits than its factorization.

231081280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756 (or 746 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 231081280 is about 15201.3578340884. The cubic root of 231081280 is about 613.6512004926.

It can be divided in two parts, 231081 and 280, that added together give a square (231361 = 481²).

The spelling of 231081280 in words is "two hundred thirty-one million, eighty-one thousand, two hundred eighty".