231212247 has 16 divisors (see below), whose sum is σ = 360518400. Its totient is φ = 129048192.

The previous prime is 231212231. The next prime is 231212269. The reversal of 231212247 is 742212132.

It is not a de Polignac number, because 231212247 - 2⁴ = 231212231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231212287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127122 + ... + 128927.

It is an arithmetic number, because the mean of its divisors is an integer number (22532400).

Almost surely, 2^231212247 is an apocalyptic number.

231212247 is a deficient number, since it is larger than the sum of its proper divisors (129306153).

231212247 is a wasteful number, since it uses less digits than its factorization.

231212247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256102.

The product of its digits is 1344, while the sum is 24.

The square root of 231212247 is about 15205.6649640849. The cubic root of 231212247 is about 613.7671090284.

Adding to 231212247 its reverse (742212132), we get a palindrome (973424379).

The spelling of 231212247 in words is "two hundred thirty-one million, two hundred twelve thousand, two hundred forty-seven".