206512069 has 4 divisors (see below), whose sum is σ = 206819596. Its totient is φ = 206204544.

The previous prime is 206512067. The next prime is 206512081. The reversal of 206512069 is 960215602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 960215602 = 2 ⋅480107801.

It can be written as a sum of positive squares in 2 ways, for example, as 60996100 + 145515969 = 7810^2 + 12063^2 .

It is a cyclic number.

It is not a de Polignac number, because 206512069 - 2¹ = 206512067 is a prime.

It is a super-2 number, since 2×206512069² = 85294469285321522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206512069.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206512067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152754 + ... + 154099.

It is an arithmetic number, because the mean of its divisors is an integer number (51704899).

Almost surely, 2^206512069 is an apocalyptic number.

It is an amenable number.

206512069 is a deficient number, since it is larger than the sum of its proper divisors (307527).

206512069 is an equidigital number, since it uses as much as digits as its factorization.

206512069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307526.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 206512069 is about 14370.5277912817. The cubic root of 206512069 is about 591.0830141358.

The spelling of 206512069 in words is "two hundred six million, five hundred twelve thousand, sixty-nine".