206135605 has 16 divisors (see below), whose sum is σ = 268498944. Its totient is φ = 151018560.

The previous prime is 206135599. The next prime is 206135609. The reversal of 206135605 is 506531602.

It is not a de Polignac number, because 206135605 - 2³ = 206135597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206135609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4231 + ... + 20740.

It is an arithmetic number, because the mean of its divisors is an integer number (16781184).

Almost surely, 2^206135605 is an apocalyptic number.

It is an amenable number.

206135605 is a deficient number, since it is larger than the sum of its proper divisors (62363339).

206135605 is a wasteful number, since it uses less digits than its factorization.

206135605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25116.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 206135605 is about 14357.4233412545. The cubic root of 206135605 is about 590.7236213729.

The spelling of 206135605 in words is "two hundred six million, one hundred thirty-five thousand, six hundred five".