206310145 has 4 divisors (see below), whose sum is σ = 247572180. Its totient is φ = 165048112.

The previous prime is 206310127. The next prime is 206310157. The reversal of 206310145 is 541013602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77986561 + 128323584 = 8831^2 + 11328^2 .

It is a cyclic number.

It is not a de Polignac number, because 206310145 - 2⁹ = 206309633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20631010 + ... + 20631019.

It is an arithmetic number, because the mean of its divisors is an integer number (61893045).

Almost surely, 2^206310145 is an apocalyptic number.

It is an amenable number.

206310145 is a deficient number, since it is larger than the sum of its proper divisors (41262035).

206310145 is an equidigital number, since it uses as much as digits as its factorization.

206310145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41262034.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 206310145 is about 14363.5004438333. The cubic root of 206310145 is about 590.8903009948.

Adding to 206310145 its reverse (541013602), we get a palindrome (747323747).

The spelling of 206310145 in words is "two hundred six million, three hundred ten thousand, one hundred forty-five".