213668417 has 2 divisors, whose sum is σ = 213668418. Its totient is φ = 213668416.

The previous prime is 213668401. The next prime is 213668443. The reversal of 213668417 is 714866312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210859441 + 2808976 = 14521^2 + 1676^2 .

It is a cyclic number.

It is not a de Polignac number, because 213668417 - 2⁴ = 213668401 is a prime.

It is not a weakly prime, because it can be changed into another prime (213668617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106834208 + 106834209.

It is an arithmetic number, because the mean of its divisors is an integer number (106834209).

Almost surely, 2^213668417 is an apocalyptic number.

It is an amenable number.

213668417 is a deficient number, since it is larger than the sum of its proper divisors (1).

213668417 is an equidigital number, since it uses as much as digits as its factorization.

213668417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 38.

The square root of 213668417 is about 14617.4011712069. The cubic root of 213668417 is about 597.8333120422.

The spelling of 213668417 in words is "two hundred thirteen million, six hundred sixty-eight thousand, four hundred seventeen".