2164747909 has 4 divisors (see below), whose sum is σ = 2166006016. Its totient is φ = 2163489804.

The previous prime is 2164747903. The next prime is 2164747943. The reversal of 2164747909 is 9097474612.

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 a cyclic number.

It is not a de Polignac number, because 2164747909 - 2³ = 2164747901 is a prime.

It is a super-2 number, since 2×2164747909² = 9372267019039744562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2164747901) 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, 626469 + ... + 629914.

It is an arithmetic number, because the mean of its divisors is an integer number (541501504).

Almost surely, 2^2164747909 is an apocalyptic number.

It is an amenable number.

2164747909 is a deficient number, since it is larger than the sum of its proper divisors (1258107).

2164747909 is a wasteful number, since it uses less digits than its factorization.

2164747909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258106.

The product of its (nonzero) digits is 762048, while the sum is 49.

The square root of 2164747909 is about 46526.8514838475. The cubic root of 2164747909 is about 1293.6072560692.

The spelling of 2164747909 in words is "two billion, one hundred sixty-four million, seven hundred forty-seven thousand, nine hundred nine".