231543681 has 8 divisors (see below), whose sum is σ = 318683904. Its totient is φ = 149382960.

The previous prime is 231543677. The next prime is 231543703. The reversal of 231543681 is 186345132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231543681 - 2² = 231543677 is a prime.

It is a super-2 number, since 2×231543681² = 107224952422059522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231543661) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1244766 + ... + 1244951.

It is an arithmetic number, because the mean of its divisors is an integer number (39835488).

Almost surely, 2^231543681 is an apocalyptic number.

It is an amenable number.

231543681 is a deficient number, since it is larger than the sum of its proper divisors (87140223).

231543681 is a wasteful number, since it uses less digits than its factorization.

231543681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2489751.

The product of its digits is 17280, while the sum is 33.

The square root of 231543681 is about 15216.5594337222. The cubic root of 231543681 is about 614.0602396449.

The spelling of 231543681 in words is "two hundred thirty-one million, five hundred forty-three thousand, six hundred eighty-one".