213641 has 2 divisors, whose sum is σ = 213642. Its totient is φ = 213640.

The previous prime is 213637. The next prime is 213649. The reversal of 213641 is 146312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126025 + 87616 = 355^2 + 296^2 .

It is a cyclic number.

It is not a de Polignac number, because 213641 - 2² = 213637 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (213649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106820 + 106821.

It is an arithmetic number, because the mean of its divisors is an integer number (106821).

2²¹³⁶⁴¹ is an apocalyptic number.

It is an amenable number.

213641 is a deficient number, since it is larger than the sum of its proper divisors (1).

213641 is an equidigital number, since it uses as much as digits as its factorization.

213641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 17.

The square root of 213641 is about 462.2131542914. The cubic root of 213641 is about 59.7807740493.

Adding to 213641 its reverse (146312), we get a palindrome (359953).

The spelling of 213641 in words is "two hundred thirteen thousand, six hundred forty-one".