213011009 has 4 divisors (see below), whose sum is σ = 213185280. Its totient is φ = 212836740.

The previous prime is 213010997. The next prime is 213011011. The reversal of 213011009 is 900110312.

It is a happy number.

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 213011009 - 2⁸ = 213010753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213011039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85289 + ... + 87750.

It is an arithmetic number, because the mean of its divisors is an integer number (53296320).

Almost surely, 2^213011009 is an apocalyptic number.

It is an amenable number.

213011009 is a deficient number, since it is larger than the sum of its proper divisors (174271).

213011009 is a wasteful number, since it uses less digits than its factorization.

213011009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174270.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 213011009 is about 14594.8966765784. The cubic root of 213011009 is about 597.2195508144.

The spelling of 213011009 in words is "two hundred thirteen million, eleven thousand, nine".