231206013 has 6 divisors (see below), whose sum is σ = 333964254. Its totient is φ = 154137336.

The previous prime is 231205991. The next prime is 231206077. The reversal of 231206013 is 310602132.

It can be written as a sum of positive squares in only one way, i.e., 119311929 + 111894084 = 10923^2 + 10578^2 .

It is not a de Polignac number, because 231206013 - 2¹⁰ = 231204989 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 5 ways as a sum of consecutive naturals, for example, 12844770 + ... + 12844787.

It is an arithmetic number, because the mean of its divisors is an integer number (55660709).

Almost surely, 2^231206013 is an apocalyptic number.

It is an amenable number.

231206013 is a deficient number, since it is larger than the sum of its proper divisors (102758241).

231206013 is a wasteful number, since it uses less digits than its factorization.

231206013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25689563 (or 25689560 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 231206013 is about 15205.4599733122. The cubic root of 231206013 is about 613.7615928002.

Adding to 231206013 its reverse (310602132), we get a palindrome (541808145).

The spelling of 231206013 in words is "two hundred thirty-one million, two hundred six thousand, thirteen".