206561115 has 24 divisors (see below), whose sum is σ = 358963488. Its totient is φ = 109881600.

The previous prime is 206561107. The next prime is 206561123. The reversal of 206561115 is 511165602.

It is a happy number.

206561115 is a `hidden beast` number, since 2 + 0 + 656 + 1 + 1 + 1 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (206561107) and next prime (206561123).

It is not a de Polignac number, because 206561115 - 2³ = 206561107 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12322 + ... + 23768.

It is an arithmetic number, because the mean of its divisors is an integer number (14956812).

Almost surely, 2^206561115 is an apocalyptic number.

206561115 is a deficient number, since it is larger than the sum of its proper divisors (152402373).

206561115 is a wasteful number, since it uses less digits than its factorization.

206561115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11859 (or 11856 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 206561115 is about 14372.2341687018. The cubic root of 206561115 is about 591.1298039157.

The spelling of 206561115 in words is "two hundred six million, five hundred sixty-one thousand, one hundred fifteen".