231660213 has 8 divisors (see below), whose sum is σ = 309101568. Its totient is φ = 154329504.

The previous prime is 231660211. The next prime is 231660223. The reversal of 231660213 is 312066132.

It is a happy number.

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

It is not a de Polignac number, because 231660213 - 2¹ = 231660211 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231660211) 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, 22645 + ... + 31242.

It is an arithmetic number, because the mean of its divisors is an integer number (38637696).

Almost surely, 2^231660213 is an apocalyptic number.

It is an amenable number.

231660213 is a deficient number, since it is larger than the sum of its proper divisors (77441355).

231660213 is a wasteful number, since it uses less digits than its factorization.

231660213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55323.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 231660213 is about 15220.3880699541. The cubic root of 231660213 is about 614.1632377290.

The spelling of 231660213 in words is "two hundred thirty-one million, six hundred sixty thousand, two hundred thirteen".