206342161 has 4 divisors (see below), whose sum is σ = 207917424. Its totient is φ = 204766900.

The previous prime is 206342159. The next prime is 206342167. The reversal of 206342161 is 161243602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 206342161 - 2¹ = 206342159 is a prime.

It is a super-2 number, since 2×206342161² = 85154174812299842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206342167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 787435 + ... + 787696.

It is an arithmetic number, because the mean of its divisors is an integer number (51979356).

Almost surely, 2^206342161 is an apocalyptic number.

It is an amenable number.

206342161 is a deficient number, since it is larger than the sum of its proper divisors (1575263).

206342161 is a wasteful number, since it uses less digits than its factorization.

206342161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575262.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 206342161 is about 14364.6148921577. The cubic root of 206342161 is about 590.9208649553.

Adding to 206342161 its reverse (161243602), we get a palindrome (367585763).

The spelling of 206342161 in words is "two hundred six million, three hundred forty-two thousand, one hundred sixty-one".