231140142 has 24 divisors (see below), whose sum is σ = 519353016. Its totient is φ = 77046552.

The previous prime is 231140131. The next prime is 231140183. The reversal of 231140142 is 241041132.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent 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 11 ways as a sum of consecutive naturals, for example, 237313 + ... + 238284.

It is an arithmetic number, because the mean of its divisors is an integer number (21639709).

Almost surely, 2^231140142 is an apocalyptic number.

231140142 is an abundant number, since it is smaller than the sum of its proper divisors (288212874).

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

231140142 is an equidigital number, since it uses as much as digits as its factorization.

231140142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475614 (or 475602 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 231140142 is about 15203.2937878606. The cubic root of 231140142 is about 613.7033000113.

Adding to 231140142 its reverse (241041132), we get a palindrome (472181274).

The spelling of 231140142 in words is "two hundred thirty-one million, one hundred forty thousand, one hundred forty-two".