213116569 has 2 divisors, whose sum is σ = 213116570. Its totient is φ = 213116568.

The previous prime is 213116567. The next prime is 213116581. The reversal of 213116569 is 965611312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128255625 + 84860944 = 11325^2 + 9212^2 .

It is a cyclic number.

It is not a de Polignac number, because 213116569 - 2¹ = 213116567 is a prime.

It is a super-4 number, since 4×213116569⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

Together with 213116567, it forms a pair of twin primes.

It is equal to p_11764096 and since 213116569 and 11764096 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (213116567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106558284 + 106558285.

It is an arithmetic number, because the mean of its divisors is an integer number (106558285).

Almost surely, 2^213116569 is an apocalyptic number.

It is an amenable number.

213116569 is a deficient number, since it is larger than the sum of its proper divisors (1).

213116569 is an equidigital number, since it uses as much as digits as its factorization.

213116569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 34.

The square root of 213116569 is about 14598.5125612166. The cubic root of 213116569 is about 597.3181874766.

The spelling of 213116569 in words is "two hundred thirteen million, one hundred sixteen thousand, five hundred sixty-nine".