206694457 has 2 divisors, whose sum is σ = 206694458. Its totient is φ = 206694456.

The previous prime is 206694451. The next prime is 206694473. The reversal of 206694457 is 754496602.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202322176 + 4372281 = 14224^2 + 2091^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206694457 is a prime.

It is not a weakly prime, because it can be changed into another prime (206694451) 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, 103347228 + 103347229.

It is an arithmetic number, because the mean of its divisors is an integer number (103347229).

Almost surely, 2^206694457 is an apocalyptic number.

It is an amenable number.

206694457 is a deficient number, since it is larger than the sum of its proper divisors (1).

206694457 is an equidigital number, since it uses as much as digits as its factorization.

206694457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 206694457 is about 14376.8722954612. The cubic root of 206694457 is about 591.2569744718.

The spelling of 206694457 in words is "two hundred six million, six hundred ninety-four thousand, four hundred fifty-seven".