231312216643 has 8 divisors (see below), whose sum is σ = 245575443168. Its totient is φ = 217121948544.

The previous prime is 231312216607. The next prime is 231312216659. The reversal of 231312216643 is 346612213132.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 231312216643 - 2³⁷ = 93873263171 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231312216599 and 231312216608.

It is not an unprimeable number, because it can be changed into a prime (231312216683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18233071 + ... + 18245752.

It is an arithmetic number, because the mean of its divisors is an integer number (30696930396).

Almost surely, 2^231312216643 is an apocalyptic number.

231312216643 is a deficient number, since it is larger than the sum of its proper divisors (14263226525).

231312216643 is a wasteful number, since it uses less digits than its factorization.

231312216643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36479213.

The product of its digits is 31104, while the sum is 34.

Adding to 231312216643 its reverse (346612213132), we get a palindrome (577924429775).

The spelling of 231312216643 in words is "two hundred thirty-one billion, three hundred twelve million, two hundred sixteen thousand, six hundred forty-three".