206149457 has 2 divisors, whose sum is σ = 206149458. Its totient is φ = 206149456.

The previous prime is 206149421. The next prime is 206149469. The reversal of 206149457 is 754941602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202749121 + 3400336 = 14239^2 + 1844^2 .

It is a cyclic number.

It is not a de Polignac number, because 206149457 - 2¹² = 206145361 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206149457.

It is not a weakly prime, because it can be changed into another prime (206149477) 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, 103074728 + 103074729.

It is an arithmetic number, because the mean of its divisors is an integer number (103074729).

Almost surely, 2^206149457 is an apocalyptic number.

It is an amenable number.

206149457 is a deficient number, since it is larger than the sum of its proper divisors (1).

206149457 is an equidigital number, since it uses as much as digits as its factorization.

206149457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 206149457 is about 14357.9057316866. The cubic root of 206149457 is about 590.7368529870.

The spelling of 206149457 in words is "two hundred six million, one hundred forty-nine thousand, four hundred fifty-seven".