213697217 has 2 divisors, whose sum is σ = 213697218. Its totient is φ = 213697216.

The previous prime is 213697193. The next prime is 213697223. The reversal of 213697217 is 712796312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160757041 + 52940176 = 12679^2 + 7276^2 .

It is a cyclic number.

It is not a de Polignac number, because 213697217 - 2¹⁶ = 213631681 is a prime.

It is not a weakly prime, because it can be changed into another prime (213697247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106848608 + 106848609.

It is an arithmetic number, because the mean of its divisors is an integer number (106848609).

Almost surely, 2^213697217 is an apocalyptic number.

It is an amenable number.

213697217 is a deficient number, since it is larger than the sum of its proper divisors (1).

213697217 is an equidigital number, since it uses as much as digits as its factorization.

213697217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 38.

The square root of 213697217 is about 14618.3862652483. The cubic root of 213697217 is about 597.8601711449.

The spelling of 213697217 in words is "two hundred thirteen million, six hundred ninety-seven thousand, two hundred seventeen".