206990473 has 2 divisors, whose sum is σ = 206990474. Its totient is φ = 206990472.

The previous prime is 206990431. The next prime is 206990513. The reversal of 206990473 is 374099602.

It is an a-pointer prime, because the next prime (206990513) can be obtained adding 206990473 to its sum of digits (40).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159062544 + 47927929 = 12612^2 + 6923^2 .

It is a cyclic number.

It is not a de Polignac number, because 206990473 - 2⁹ = 206989961 is a prime.

It is not a weakly prime, because it can be changed into another prime (206990573) 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, 103495236 + 103495237.

It is an arithmetic number, because the mean of its divisors is an integer number (103495237).

Almost surely, 2^206990473 is an apocalyptic number.

It is an amenable number.

206990473 is a deficient number, since it is larger than the sum of its proper divisors (1).

206990473 is an equidigital number, since it uses as much as digits as its factorization.

206990473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 206990473 is about 14387.1634799915. The cubic root of 206990473 is about 591.5390946627.

The spelling of 206990473 in words is "two hundred six million, nine hundred ninety thousand, four hundred seventy-three".