231321140 has 12 divisors (see below), whose sum is σ = 485774436. Its totient is φ = 92528448.

The previous prime is 231321137. The next prime is 231321161. The reversal of 231321140 is 41123132.

It can be written as a sum of positive squares in 2 ways, for example, as 39664804 + 191656336 = 6298^2 + 13844^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5783009 + ... + 5783048.

It is an arithmetic number, because the mean of its divisors is an integer number (40481203).

Almost surely, 2^231321140 is an apocalyptic number.

231321140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231321140 is an abundant number, since it is smaller than the sum of its proper divisors (254453296).

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

231321140 is a wasteful number, since it uses less digits than its factorization.

231321140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11566066 (or 11566064 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 231321140 is about 15209.2452146712. The cubic root of 231321140 is about 613.8634482912.

Adding to 231321140 its reverse (41123132), we get a palindrome (272444272).

The spelling of 231321140 in words is "two hundred thirty-one million, three hundred twenty-one thousand, one hundred forty".