231212109 has 8 divisors (see below), whose sum is σ = 312884320. Its totient is φ = 151840656.

The previous prime is 231212071. The next prime is 231212141. The reversal of 231212109 is 901212132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231212109 - 2¹⁵ = 231179341 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231212309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 574954 + ... + 575355.

It is an arithmetic number, because the mean of its divisors is an integer number (39110540).

Almost surely, 2^231212109 is an apocalyptic number.

It is an amenable number.

231212109 is a deficient number, since it is larger than the sum of its proper divisors (81672211).

231212109 is a wasteful number, since it uses less digits than its factorization.

231212109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150379.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 231212109 is about 15205.6604263018. The cubic root of 231212109 is about 613.7669869186.

The spelling of 231212109 in words is "two hundred thirty-one million, two hundred twelve thousand, one hundred nine".