211142609 has 8 divisors (see below), whose sum is σ = 218154048. Its totient is φ = 204199920.

The previous prime is 211142593. The next prime is 211142639. The reversal of 211142609 is 906241112.

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

It is a cyclic number.

It is not a de Polignac number, because 211142609 - 2⁴ = 211142593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211142639) 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, 10907 + ... + 23264.

It is an arithmetic number, because the mean of its divisors is an integer number (27269256).

Almost surely, 2^211142609 is an apocalyptic number.

It is an amenable number.

211142609 is a deficient number, since it is larger than the sum of its proper divisors (7011439).

211142609 is a wasteful number, since it uses less digits than its factorization.

211142609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34375.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 211142609 is about 14530.7470214026. The cubic root of 211142609 is about 595.4682743507.

The spelling of 211142609 in words is "two hundred eleven million, one hundred forty-two thousand, six hundred nine".