231663213 has 16 divisors (see below), whose sum is σ = 344139840. Its totient is φ = 154021392.

The previous prime is 231663203. The next prime is 231663277. The reversal of 231663213 is 312366132.

It is a happy number.

231663213 is a `hidden beast` number, since 2 + 3 + 16 + 632 + 13 = 666.

It is not a de Polignac number, because 231663213 - 2⁴ = 231663197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231663203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1431 + ... + 21572.

It is an arithmetic number, because the mean of its divisors is an integer number (21508740).

Almost surely, 2^231663213 is an apocalyptic number.

It is an amenable number.

231663213 is a deficient number, since it is larger than the sum of its proper divisors (112476627).

231663213 is a wasteful number, since it uses less digits than its factorization.

231663213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23385 (or 23379 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

The square root of 231663213 is about 15220.4866216557. The cubic root of 231663213 is about 614.1658888558.

The spelling of 231663213 in words is "two hundred thirty-one million, six hundred sixty-three thousand, two hundred thirteen".