213539 has 2 divisors, whose sum is σ = 213540. Its totient is φ = 213538.

The previous prime is 213533. The next prime is 213553. The reversal of 213539 is 935312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213539 - 2⁴ = 213523 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213533) 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, 106769 + 106770.

It is an arithmetic number, because the mean of its divisors is an integer number (106770).

2²¹³⁵³⁹ is an apocalyptic number.

213539 is a deficient number, since it is larger than the sum of its proper divisors (1).

213539 is an equidigital number, since it uses as much as digits as its factorization.

213539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 810, while the sum is 23.

The square root of 213539 is about 462.1028024152. The cubic root of 213539 is about 59.7712586947.

The spelling of 213539 in words is "two hundred thirteen thousand, five hundred thirty-nine".