211828009 has 8 divisors (see below), whose sum is σ = 213071040. Its totient is φ = 210589200.

The previous prime is 211827983. The next prime is 211828021. The reversal of 211828009 is 900828112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211828009 is a prime.

It is a super-2 number, since 2×211828009² = 89742210793808162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211828039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167622 + ... + 168880.

It is an arithmetic number, because the mean of its divisors is an integer number (26633880).

Almost surely, 2^211828009 is an apocalyptic number.

It is an amenable number.

211828009 is a deficient number, since it is larger than the sum of its proper divisors (1243031).

211828009 is a wasteful number, since it uses less digits than its factorization.

211828009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2111.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 211828009 is about 14554.3123849944. The cubic root of 211828009 is about 596.1119043138. Note that the first 3 decimals are identical.

The spelling of 211828009 in words is "two hundred eleven million, eight hundred twenty-eight thousand, nine".