206997641 has 2 divisors, whose sum is σ = 206997642. Its totient is φ = 206997640.

The previous prime is 206997629. The next prime is 206997667. The reversal of 206997641 is 146799602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201044041 + 5953600 = 14179^2 + 2440^2 .

It is a cyclic number.

It is not a de Polignac number, because 206997641 - 2¹⁰ = 206996617 is a prime.

It is a super-3 number, since 3×206997641³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 206997592 and 206997601.

It is not a weakly prime, because it can be changed into another prime (206997671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103498820 + 103498821.

It is an arithmetic number, because the mean of its divisors is an integer number (103498821).

Almost surely, 2^206997641 is an apocalyptic number.

It is an amenable number.

206997641 is a deficient number, since it is larger than the sum of its proper divisors (1).

206997641 is an equidigital number, since it uses as much as digits as its factorization.

206997641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 206997641 is about 14387.4125887875. The cubic root of 206997641 is about 591.5459228405.

The spelling of 206997641 in words is "two hundred six million, nine hundred ninety-seven thousand, six hundred forty-one".