206175121 has 2 divisors, whose sum is σ = 206175122. Its totient is φ = 206175120.

The previous prime is 206175119. The next prime is 206175127. The reversal of 206175121 is 121571602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189365121 + 16810000 = 13761^2 + 4100^2 .

It is a cyclic number.

It is not a de Polignac number, because 206175121 - 2¹ = 206175119 is a prime.

It is a super-5 number, since 5×206175121⁵ (a number of 43 digits) contains 55555 as substring.

Together with 206175119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (206175127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103087560 + 103087561.

It is an arithmetic number, because the mean of its divisors is an integer number (103087561).

Almost surely, 2^206175121 is an apocalyptic number.

It is an amenable number.

206175121 is a deficient number, since it is larger than the sum of its proper divisors (1).

206175121 is an equidigital number, since it uses as much as digits as its factorization.

206175121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 206175121 is about 14358.7994275288. The cubic root of 206175121 is about 590.7613660138.

The spelling of 206175121 in words is "two hundred six million, one hundred seventy-five thousand, one hundred twenty-one".