847647971949 has 4 divisors (see below), whose sum is σ = 1130197295936. Its totient is φ = 565098647964.

The previous prime is 847647971923. The next prime is 847647971957. The reversal of 847647971949 is 949179746748.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 847647971949 - 2⁹ = 847647971437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (847647971909) 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, 141274661989 + ... + 141274661994.

It is an arithmetic number, because the mean of its divisors is an integer number (282549323984).

Almost surely, 2^847647971949 is an apocalyptic number.

It is an amenable number.

847647971949 is a deficient number, since it is larger than the sum of its proper divisors (282549323987).

847647971949 is a wasteful number, since it uses less digits than its factorization.

847647971949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282549323986.

The product of its digits is 768144384, while the sum is 75.

The spelling of 847647971949 in words is "eight hundred forty-seven billion, six hundred forty-seven million, nine hundred seventy-one thousand, nine hundred forty-nine".