213604397 has 2 divisors, whose sum is σ = 213604398. Its totient is φ = 213604396.

The previous prime is 213604333. The next prime is 213604429. The reversal of 213604397 is 793406312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206813161 + 6791236 = 14381^2 + 2606^2 .

It is a cyclic number.

It is not a de Polignac number, because 213604397 - 2⁶ = 213604333 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213604297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106802198 + 106802199.

It is an arithmetic number, because the mean of its divisors is an integer number (106802199).

Almost surely, 2^213604397 is an apocalyptic number.

It is an amenable number.

213604397 is a deficient number, since it is larger than the sum of its proper divisors (1).

213604397 is an equidigital number, since it uses as much as digits as its factorization.

213604397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 213604397 is about 14615.2111513998. The cubic root of 213604397 is about 597.7735978483.

The spelling of 213604397 in words is "two hundred thirteen million, six hundred four thousand, three hundred ninety-seven".