2164731847 has 4 divisors (see below), whose sum is σ = 2183888880. Its totient is φ = 2145574816.

The previous prime is 2164731799. The next prime is 2164731913. The reversal of 2164731847 is 7481374612.

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

It is a cyclic number.

It is not a de Polignac number, because 2164731847 - 2⁷ = 2164731719 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 (2164735847) 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, 9578347 + ... + 9578572.

It is an arithmetic number, because the mean of its divisors is an integer number (545972220).

Almost surely, 2^2164731847 is an apocalyptic number.

2164731847 is a deficient number, since it is larger than the sum of its proper divisors (19157033).

2164731847 is a wasteful number, since it uses less digits than its factorization.

2164731847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19157032.

The product of its digits is 225792, while the sum is 43.

The square root of 2164731847 is about 46526.6788735237. The cubic root of 2164731847 is about 1293.6040566249.

The spelling of 2164731847 in words is "two billion, one hundred sixty-four million, seven hundred thirty-one thousand, eight hundred forty-seven".