231311140 has 12 divisors (see below), whose sum is σ = 485753436. Its totient is φ = 92524448.

The previous prime is 231311107. The next prime is 231311153. The reversal of 231311140 is 41113132.

It can be written as a sum of positive squares in 2 ways, for example, as 112021056 + 119290084 = 10584^2 + 10922^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5782759 + ... + 5782798.

It is an arithmetic number, because the mean of its divisors is an integer number (40479453).

Almost surely, 2^231311140 is an apocalyptic number.

231311140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231311140 is an abundant number, since it is smaller than the sum of its proper divisors (254442296).

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

231311140 is a wasteful number, since it uses less digits than its factorization.

231311140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11565566 (or 11565564 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 231311140 is about 15208.9164637064. The cubic root of 231311140 is about 613.8546024028.

Adding to 231311140 its reverse (41113132), we get a palindrome (272424272).

The spelling of 231311140 in words is "two hundred thirty-one million, three hundred eleven thousand, one hundred forty".