231206613 has 16 divisors (see below), whose sum is σ = 356083776. Its totient is φ = 131882240.

The previous prime is 231206561. The next prime is 231206627. The reversal of 231206613 is 316602132.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 231206613 - 2¹⁰ = 231205589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231206413) 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 15 ways as a sum of consecutive naturals, for example, 205506 + ... + 206627.

It is an arithmetic number, because the mean of its divisors is an integer number (22255236).

Almost surely, 2^231206613 is an apocalyptic number.

It is an amenable number.

231206613 is a deficient number, since it is larger than the sum of its proper divisors (124877163).

231206613 is a wasteful number, since it uses less digits than its factorization.

231206613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412164.

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

The square root of 231206613 is about 15205.4797030544. The cubic root of 231206613 is about 613.7621237216.

Adding to 231206613 its reverse (316602132), we get a palindrome (547808745).

The spelling of 231206613 in words is "two hundred thirty-one million, two hundred six thousand, six hundred thirteen".