213644135 has 4 divisors (see below), whose sum is σ = 256372968. Its totient is φ = 170915304.

The previous prime is 213644111. The next prime is 213644141. The reversal of 213644135 is 531446312.

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

It is a cyclic number.

It is not a de Polignac number, because 213644135 - 2²² = 209449831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213644098 and 213644107.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21364409 + ... + 21364418.

It is an arithmetic number, because the mean of its divisors is an integer number (64093242).

Almost surely, 2^213644135 is an apocalyptic number.

213644135 is a deficient number, since it is larger than the sum of its proper divisors (42728833).

213644135 is an equidigital number, since it uses as much as digits as its factorization.

213644135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42728832.

The product of its digits is 8640, while the sum is 29.

The square root of 213644135 is about 14616.5705622078. The cubic root of 213644135 is about 597.8106645858.

The spelling of 213644135 in words is "two hundred thirteen million, six hundred forty-four thousand, one hundred thirty-five".