312821131909 has 8 divisors (see below), whose sum is σ = 367510141152. Its totient is φ = 262507243440.

The previous prime is 312821131891. The next prime is 312821131921. The reversal of 312821131909 is 909131128213.

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

It is a de Polignac number, because none of the positive numbers 2^k-312821131909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312821131949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1093780039 + ... + 1093780324.

It is an arithmetic number, because the mean of its divisors is an integer number (45938767644).

Almost surely, 2^312821131909 is an apocalyptic number.

It is an amenable number.

312821131909 is a deficient number, since it is larger than the sum of its proper divisors (54689009243).

312821131909 is a wasteful number, since it uses less digits than its factorization.

312821131909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2187560387.

The product of its (nonzero) digits is 23328, while the sum is 40.

The spelling of 312821131909 in words is "three hundred twelve billion, eight hundred twenty-one million, one hundred thirty-one thousand, nine hundred nine".