206990369 has 2 divisors, whose sum is σ = 206990370. Its totient is φ = 206990368.

The previous prime is 206990359. The next prime is 206990411. The reversal of 206990369 is 963099602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140730769 + 66259600 = 11863^2 + 8140^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206990369 is a prime.

It is a super-2 number, since 2×206990369² = 85690025717512322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (206990359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103495184 + 103495185.

It is an arithmetic number, because the mean of its divisors is an integer number (103495185).

Almost surely, 2^206990369 is an apocalyptic number.

It is an amenable number.

206990369 is a deficient number, since it is larger than the sum of its proper divisors (1).

206990369 is an equidigital number, since it uses as much as digits as its factorization.

206990369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157464, while the sum is 44.

The square root of 206990369 is about 14387.1598656580. The cubic root of 206990369 is about 591.5389955920.

The spelling of 206990369 in words is "two hundred six million, nine hundred ninety thousand, three hundred sixty-nine".