213397 has 2 divisors, whose sum is σ = 213398. Its totient is φ = 213396.

The previous prime is 213391. The next prime is 213407. The reversal of 213397 is 793312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152881 + 60516 = 391^2 + 246^2 .

It is a cyclic number.

It is not a de Polignac number, because 213397 - 2¹¹ = 211349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106698 + 106699.

It is an arithmetic number, because the mean of its divisors is an integer number (106699).

2²¹³³⁹⁷ is an apocalyptic number.

It is an amenable number.

213397 is a deficient number, since it is larger than the sum of its proper divisors (1).

213397 is an equidigital number, since it uses as much as digits as its factorization.

213397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134, while the sum is 25.

The square root of 213397 is about 461.9491313987. The cubic root of 213397 is about 59.7580067817.

The spelling of 213397 in words is "two hundred thirteen thousand, three hundred ninety-seven".