231665213 has 8 divisors (see below), whose sum is σ = 250185600. Its totient is φ = 213244848.

The previous prime is 231665207. The next prime is 231665243. The reversal of 231665213 is 312566132.

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 231665213 - 2⁶ = 231665149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231665243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20153 + ... + 29486.

It is an arithmetic number, because the mean of its divisors is an integer number (31273200).

Almost surely, 2^231665213 is an apocalyptic number.

It is an amenable number.

231665213 is a deficient number, since it is larger than the sum of its proper divisors (18520387).

231665213 is a wasteful number, since it uses less digits than its factorization.

231665213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50011.

The product of its digits is 6480, while the sum is 29.

The square root of 231665213 is about 15220.5523224356. The cubic root of 231665213 is about 614.1676562609.

The spelling of 231665213 in words is "two hundred thirty-one million, six hundred sixty-five thousand, two hundred thirteen".