231022143 has 48 divisors (see below), whose sum is σ = 385482240. Its totient is φ = 131947200.

The previous prime is 231022123. The next prime is 231022171. The reversal of 231022143 is 341220132.

It is not a de Polignac number, because 231022143 - 2⁶ = 231022079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231022123) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 160953 + ... + 162381.

It is an arithmetic number, because the mean of its divisors is an integer number (8030880).

Almost surely, 2^231022143 is an apocalyptic number.

231022143 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

231022143 is a deficient number, since it is larger than the sum of its proper divisors (154460097).

231022143 is a wasteful number, since it uses less digits than its factorization.

231022143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540 (or 1537 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 231022143 is about 15199.4125873338. The cubic root of 231022143 is about 613.5988486575.

Adding to 231022143 its reverse (341220132), we get a palindrome (572242275).

The spelling of 231022143 in words is "two hundred thirty-one million, twenty-two thousand, one hundred forty-three".