213664697 has 2 divisors, whose sum is σ = 213664698. Its totient is φ = 213664696.

The previous prime is 213664691. The next prime is 213664739. The reversal of 213664697 is 796466312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177315856 + 36348841 = 13316^2 + 6029^2 .

It is a cyclic number.

It is not a de Polignac number, because 213664697 - 2⁴ = 213664681 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213664691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106832348 + 106832349.

It is an arithmetic number, because the mean of its divisors is an integer number (106832349).

Almost surely, 2^213664697 is an apocalyptic number.

It is an amenable number.

213664697 is a deficient number, since it is larger than the sum of its proper divisors (1).

213664697 is an equidigital number, since it uses as much as digits as its factorization.

213664697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 44.

The square root of 213664697 is about 14617.2739250518. The cubic root of 213664697 is about 597.8298425654.

The spelling of 213664697 in words is "two hundred thirteen million, six hundred sixty-four thousand, six hundred ninety-seven".