213791 has 2 divisors, whose sum is σ = 213792. Its totient is φ = 213790.

The previous prime is 213751. The next prime is 213799. The reversal of 213791 is 197312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213791 - 2⁶ = 213727 is a prime.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 213791.

It is not a weakly prime, because it can be changed into another prime (213799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106895 + 106896.

It is an arithmetic number, because the mean of its divisors is an integer number (106896).

2²¹³⁷⁹¹ is an apocalyptic number.

213791 is a deficient number, since it is larger than the sum of its proper divisors (1).

213791 is an equidigital number, since it uses as much as digits as its factorization.

213791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378, while the sum is 23.

The square root of 213791 is about 462.3753886184. The cubic root of 213791 is about 59.7947617176.

The spelling of 213791 in words is "two hundred thirteen thousand, seven hundred ninety-one".