206424457 has 2 divisors, whose sum is σ = 206424458. Its totient is φ = 206424456.

The previous prime is 206424419. The next prime is 206424461. The reversal of 206424457 is 754424602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194993296 + 11431161 = 13964^2 + 3381^2 .

It is a cyclic number.

It is not a de Polignac number, because 206424457 - 2¹¹ = 206422409 is a prime.

It is a super-2 number, since 2×206424457² = 85222112895489698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (206424487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103212228 + 103212229.

It is an arithmetic number, because the mean of its divisors is an integer number (103212229).

Almost surely, 2^206424457 is an apocalyptic number.

It is an amenable number.

206424457 is a deficient number, since it is larger than the sum of its proper divisors (1).

206424457 is an equidigital number, since it uses as much as digits as its factorization.

206424457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53760, while the sum is 34.

The square root of 206424457 is about 14367.4791456261. The cubic root of 206424457 is about 590.9994140338. Note that the first 3 decimals are identical.

The spelling of 206424457 in words is "two hundred six million, four hundred twenty-four thousand, four hundred fifty-seven".