213391 has 2 divisors, whose sum is σ = 213392. Its totient is φ = 213390.

The previous prime is 213383. The next prime is 213397. The reversal of 213391 is 193312.

213391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213391 - 2³ = 213383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106695 + 106696.

It is an arithmetic number, because the mean of its divisors is an integer number (106696).

2²¹³³⁹¹ is an apocalyptic number.

213391 is a deficient number, since it is larger than the sum of its proper divisors (1).

213391 is an equidigital number, since it uses as much as digits as its factorization.

213391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162, while the sum is 19.

The square root of 213391 is about 461.9426371315. The cubic root of 213391 is about 59.7574467123.

The spelling of 213391 in words is "two hundred thirteen thousand, three hundred ninety-one".