206424161 has 2 divisors, whose sum is σ = 206424162. Its totient is φ = 206424160.

The previous prime is 206424143. The next prime is 206424173. The reversal of 206424161 is 161424602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117310561 + 89113600 = 10831^2 + 9440^2 .

It is a cyclic number.

It is not a de Polignac number, because 206424161 - 2¹⁸ = 206162017 is a prime.

It is a super-2 number, since 2×206424161² = 85221868489107842, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 206424161.

It is not a weakly prime, because it can be changed into another prime (206424461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103212080 + 103212081.

It is an arithmetic number, because the mean of its divisors is an integer number (103212081).

Almost surely, 2^206424161 is an apocalyptic number.

It is an amenable number.

206424161 is a deficient number, since it is larger than the sum of its proper divisors (1).

206424161 is an equidigital number, since it uses as much as digits as its factorization.

206424161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 206424161 is about 14367.4688445808. The cubic root of 206424161 is about 590.9991315480. Note that the first 3 decimals are identical.

Adding to 206424161 its reverse (161424602), we get a palindrome (367848763).

The spelling of 206424161 in words is "two hundred six million, four hundred twenty-four thousand, one hundred sixty-one".