213166517 has 2 divisors, whose sum is σ = 213166518. Its totient is φ = 213166516.

The previous prime is 213166511. The next prime is 213166531. The reversal of 213166517 is 715661312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144624676 + 68541841 = 12026^2 + 8279^2 .

It is a cyclic number.

It is not a de Polignac number, because 213166517 - 2¹² = 213162421 is a prime.

It is a super-4 number, since 4×213166517⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213166511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106583258 + 106583259.

It is an arithmetic number, because the mean of its divisors is an integer number (106583259).

Almost surely, 2^213166517 is an apocalyptic number.

It is an amenable number.

213166517 is a deficient number, since it is larger than the sum of its proper divisors (1).

213166517 is an equidigital number, since it uses as much as digits as its factorization.

213166517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 32.

The square root of 213166517 is about 14600.2231832257. The cubic root of 213166517 is about 597.3648481977.

The spelling of 213166517 in words is "two hundred thirteen million, one hundred sixty-six thousand, five hundred seventeen".