231571240 has 64 divisors (see below), whose sum is σ = 566208000. Its totient is φ = 84913920.

The previous prime is 231571231. The next prime is 231571261. The reversal of 231571240 is 42175132.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18646 + ... + 28474.

It is an arithmetic number, because the mean of its divisors is an integer number (8847000).

Almost surely, 2^231571240 is an apocalyptic number.

231571240 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 231571240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283104000).

231571240 is an abundant number, since it is smaller than the sum of its proper divisors (334636760).

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

231571240 is a wasteful number, since it uses less digits than its factorization.

231571240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9890 (or 9886 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 231571240 is about 15217.4649662813. The cubic root of 231571240 is about 614.0846010882.

The spelling of 231571240 in words is "two hundred thirty-one million, five hundred seventy-one thousand, two hundred forty".