213606005 has 4 divisors (see below), whose sum is σ = 256327212. Its totient is φ = 170884800.

The previous prime is 213605981. The next prime is 213606007. The reversal of 213606005 is 500606312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 93528241 + 120077764 = 9671^2 + 10958^2 .

It is not a de Polignac number, because 213606005 - 2¹² = 213601909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213606007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21360596 + ... + 21360605.

It is an arithmetic number, because the mean of its divisors is an integer number (64081803).

Almost surely, 2^213606005 is an apocalyptic number.

It is an amenable number.

213606005 is a deficient number, since it is larger than the sum of its proper divisors (42721207).

213606005 is an equidigital number, since it uses as much as digits as its factorization.

213606005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42721206.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 213606005 is about 14615.2661624755. The cubic root of 213606005 is about 597.7750978448.

The spelling of 213606005 in words is "two hundred thirteen million, six hundred six thousand, five".