231213105 has 12 divisors (see below), whose sum is σ = 400769460. Its totient is φ = 123313632.

The previous prime is 231213077. The next prime is 231213113. The reversal of 231213105 is 501312132.

It can be written as a sum of positive squares in 2 ways, for example, as 173923344 + 57289761 = 13188^2 + 7569^2 .

It is not a de Polignac number, because 231213105 - 2⁶ = 231213041 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2568990 + ... + 2569079.

It is an arithmetic number, because the mean of its divisors is an integer number (33397455).

Almost surely, 2^231213105 is an apocalyptic number.

It is an amenable number.

231213105 is a deficient number, since it is larger than the sum of its proper divisors (169556355).

231213105 is a wasteful number, since it uses less digits than its factorization.

231213105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5138080 (or 5138077 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 231213105 is about 15205.6931772281. The cubic root of 231213105 is about 613.7678682321.

Adding to 231213105 its reverse (501312132), we get a palindrome (732525237).

The spelling of 231213105 in words is "two hundred thirty-one million, two hundred thirteen thousand, one hundred five".