231643742 has 16 divisors (see below), whose sum is σ = 379944432. Its totient is φ = 105045120.

The previous prime is 231643733. The next prime is 231643747. The reversal of 231643742 is 247346132.

It is a junction number, because it is equal to n+sod(n) for n = 231643699 and 231643708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231643747) 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 7 ways as a sum of consecutive naturals, for example, 2633 + ... + 21684.

It is an arithmetic number, because the mean of its divisors is an integer number (23746527).

Almost surely, 2^231643742 is an apocalyptic number.

231643742 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

231643742 is a deficient number, since it is larger than the sum of its proper divisors (148300690).

231643742 is a wasteful number, since it uses less digits than its factorization.

231643742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24763.

The product of its digits is 24192, while the sum is 32.

The square root of 231643742 is about 15219.8469768917. The cubic root of 231643742 is about 614.1486817517.

Adding to 231643742 its reverse (247346132), we get a palindrome (478989874).

The spelling of 231643742 in words is "two hundred thirty-one million, six hundred forty-three thousand, seven hundred forty-two".