231488912909 has 4 divisors (see below), whose sum is σ = 245105907804. Its totient is φ = 217871918016.

The previous prime is 231488912899. The next prime is 231488912933. The reversal of 231488912909 is 909219884132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 78611822884 + 152877090025 = 280378^2 + 390995^2 .

It is a cyclic number.

It is not a de Polignac number, because 231488912909 - 2⁸ = 231488912653 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 (231488912939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6808497422 + ... + 6808497455.

It is an arithmetic number, because the mean of its divisors is an integer number (61276476951).

Almost surely, 2^231488912909 is an apocalyptic number.

It is an amenable number.

231488912909 is a deficient number, since it is larger than the sum of its proper divisors (13616994895).

231488912909 is a wasteful number, since it uses less digits than its factorization.

231488912909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13616994894.

The product of its (nonzero) digits is 2239488, while the sum is 56.

The spelling of 231488912909 in words is "two hundred thirty-one billion, four hundred eighty-eight million, nine hundred twelve thousand, nine hundred nine".