213705617 has 2 divisors, whose sum is σ = 213705618. Its totient is φ = 213705616.

The previous prime is 213705601. The next prime is 213705629. The reversal of 213705617 is 716507312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155351296 + 58354321 = 12464^2 + 7639^2 .

It is a cyclic number.

It is not a de Polignac number, because 213705617 - 2⁴ = 213705601 is a prime.

It is not a weakly prime, because it can be changed into another prime (213705637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106852808 + 106852809.

It is an arithmetic number, because the mean of its divisors is an integer number (106852809).

Almost surely, 2^213705617 is an apocalyptic number.

It is an amenable number.

213705617 is a deficient number, since it is larger than the sum of its proper divisors (1).

213705617 is an equidigital number, since it uses as much as digits as its factorization.

213705617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 213705617 is about 14618.6735718395. The cubic root of 213705617 is about 597.8680045952.

The spelling of 213705617 in words is "two hundred thirteen million, seven hundred five thousand, six hundred seventeen".