206435961 has 6 divisors (see below), whose sum is σ = 298185290. Its totient is φ = 137623968.

The previous prime is 206435959. The next prime is 206435963. The reversal of 206435961 is 169534602.

It is a happy number.

206435961 is a `hidden beast` number, since 2 + 0 + 64 + 3 + 596 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (206435959) and next prime (206435963).

It can be written as a sum of positive squares in only one way, i.e., 111957561 + 94478400 = 10581^2 + 9720^2 .

It is not a de Polignac number, because 206435961 - 2¹ = 206435959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206435963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11468656 + ... + 11468673.

Almost surely, 2^206435961 is an apocalyptic number.

It is an amenable number.

206435961 is a deficient number, since it is larger than the sum of its proper divisors (91749329).

206435961 is a wasteful number, since it uses less digits than its factorization.

206435961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22937335 (or 22937332 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 206435961 is about 14367.8794886371. The cubic root of 206435961 is about 591.0103925956.

It can be divided in two parts, 2064 and 35961, that added together give a square (38025 = 195²).

The spelling of 206435961 in words is "two hundred six million, four hundred thirty-five thousand, nine hundred sixty-one".