2173704509 has 4 divisors (see below), whose sum is σ = 2174023740. Its totient is φ = 2173385280.

The previous prime is 2173704497. The next prime is 2173704523. The reversal of 2173704509 is 9054073712.

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

It can be written as a sum of positive squares in 2 ways, for example, as 857611225 + 1316093284 = 29285^2 + 36278^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2173704509 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 (2173704569) 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, 149174 + ... + 163095.

It is an arithmetic number, because the mean of its divisors is an integer number (543505935).

Almost surely, 2^2173704509 is an apocalyptic number.

It is an amenable number.

2173704509 is a deficient number, since it is larger than the sum of its proper divisors (319231).

2173704509 is an equidigital number, since it uses as much as digits as its factorization.

2173704509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319230.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 2173704509 is about 46623.0040752417. The cubic root of 2173704509 is about 1295.3888923112.

The spelling of 2173704509 in words is "two billion, one hundred seventy-three million, seven hundred four thousand, five hundred nine".