211673009 has 2 divisors, whose sum is σ = 211673010. Its totient is φ = 211673008.

The previous prime is 211673003. The next prime is 211673023. The reversal of 211673009 is 900376112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206008609 + 5664400 = 14353^2 + 2380^2 .

It is a cyclic number.

It is not a de Polignac number, because 211673009 - 2²⁰ = 210624433 is a prime.

It is a super-4 number, since 4×211673009⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (211673003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105836504 + 105836505.

It is an arithmetic number, because the mean of its divisors is an integer number (105836505).

Almost surely, 2^211673009 is an apocalyptic number.

It is an amenable number.

211673009 is a deficient number, since it is larger than the sum of its proper divisors (1).

211673009 is an equidigital number, since it uses as much as digits as its factorization.

211673009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 211673009 is about 14548.9865282775. The cubic root of 211673009 is about 595.9664720340.

The spelling of 211673009 in words is "two hundred eleven million, six hundred seventy-three thousand, nine".