231549140 has 24 divisors (see below), whose sum is σ = 498114792. Its totient is φ = 90360320.

The previous prime is 231549139. The next prime is 231549169. The reversal of 231549140 is 41945132.

231549140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1359556 + 230189584 = 1166^2 + 15172^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140369 + ... + 142008.

It is an arithmetic number, because the mean of its divisors is an integer number (20754783).

Almost surely, 2^231549140 is an apocalyptic number.

231549140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231549140 is an abundant number, since it is smaller than the sum of its proper divisors (266565652).

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

231549140 is a wasteful number, since it uses less digits than its factorization.

231549140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282427 (or 282425 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 231549140 is about 15216.7388096136. The cubic root of 231549140 is about 614.0650654133.

The spelling of 231549140 in words is "two hundred thirty-one million, five hundred forty-nine thousand, one hundred forty".