2164541947 has 4 divisors (see below), whose sum is σ = 2184400240. Its totient is φ = 2144683656.

The previous prime is 2164541941. The next prime is 2164541989. The reversal of 2164541947 is 7491454612.

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 2164541947 - 2¹¹ = 2164539899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2164541941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9928983 + ... + 9929200.

It is an arithmetic number, because the mean of its divisors is an integer number (546100060).

Almost surely, 2^2164541947 is an apocalyptic number.

2164541947 is a deficient number, since it is larger than the sum of its proper divisors (19858293).

2164541947 is a wasteful number, since it uses less digits than its factorization.

2164541947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19858292.

The product of its digits is 241920, while the sum is 43.

The square root of 2164541947 is about 46524.6380641483. The cubic root of 2164541947 is about 1293.5662285995.

The spelling of 2164541947 in words is "two billion, one hundred sixty-four million, five hundred forty-one thousand, nine hundred forty-seven".