206894161 has 4 divisors (see below), whose sum is σ = 206937652. Its totient is φ = 206850672.

The previous prime is 206894119. The next prime is 206894167. The reversal of 206894161 is 161498602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161498602 = 2 ⋅80749301.

It can be written as a sum of positive squares in 2 ways, for example, as 101626561 + 105267600 = 10081^2 + 10260^2 .

It is a cyclic number.

It is not a de Polignac number, because 206894161 - 2²⁵ = 173339729 is a prime.

It is a deceptive number, since it divides R_206894160.

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 206894161.

It is not an unprimeable number, because it can be changed into a prime (206894167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13590 + ... + 24463.

It is an arithmetic number, because the mean of its divisors is an integer number (51734413).

Almost surely, 2^206894161 is an apocalyptic number.

206894161 is the 8305-th hex number.

It is an amenable number.

206894161 is a deficient number, since it is larger than the sum of its proper divisors (43491).

206894161 is an equidigital number, since it uses as much as digits as its factorization.

206894161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43490.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 206894161 is about 14383.8159401461. The cubic root of 206894161 is about 591.4473333510.

The spelling of 206894161 in words is "two hundred six million, eight hundred ninety-four thousand, one hundred sixty-one".