20131231009 has 8 divisors (see below), whose sum is σ = 20634162912. Its totient is φ = 19629879360.

The previous prime is 20131230947. The next prime is 20131231013. The reversal of 20131231009 is 90013213102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20131231009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20131231069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 369247 + ... + 420244.

It is an arithmetic number, because the mean of its divisors is an integer number (2579270364).

Almost surely, 2^20131231009 is an apocalyptic number.

It is an amenable number.

20131231009 is a deficient number, since it is larger than the sum of its proper divisors (502931903).

20131231009 is an equidigital number, since it uses as much as digits as its factorization.

20131231009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790127.

The product of its (nonzero) digits is 324, while the sum is 22.

The spelling of 20131231009 in words is "twenty billion, one hundred thirty-one million, two hundred thirty-one thousand, nine".