211185005 has 18 divisors (see below), whose sum is σ = 259940394. Its totient is φ = 164710656.

The previous prime is 211184983. The next prime is 211185017. The reversal of 211185005 is 500581112.

It can be written as a sum of positive squares in 3 ways, for example, as 15100996 + 196084009 = 3886^2 + 14003^2 .

It is not a de Polignac number, because 211185005 - 2⁸ = 211184749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2177117 + ... + 2177213.

It is an arithmetic number, because the mean of its divisors is an integer number (14441133).

Almost surely, 2^211185005 is an apocalyptic number.

It is an amenable number.

211185005 is a deficient number, since it is larger than the sum of its proper divisors (48755389).

211185005 is an frugal number, since it uses more digits than its factorization.

211185005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 211185005 is about 14532.2057857711. The cubic root of 211185005 is about 595.5081270100.

The spelling of 211185005 in words is "two hundred eleven million, one hundred eighty-five thousand, five".