3205711161 has 33 divisors (see below), whose sum is σ = 4829265679. Its totient is φ = 2127968496.

The previous prime is 3205711151. The next prime is 3205711169. The reversal of 3205711161 is 1611175023.

The square root of 3205711161 is 56619.

It is a perfect power (a square), and thus also a powerful number.

3205711161 is a `hidden beast` number, since 3 + 20 + 571 + 11 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 651015225 + 2554695936 = 25515^2 + 50544^2 .

It is not a de Polignac number, because 3205711161 - 2⁵ = 3205711129 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3205711169) 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 32 ways as a sum of consecutive naturals, for example, 13758301 + ... + 13758533.

Almost surely, 2^3205711161 is an apocalyptic number.

3205711161 is the 56619-th square number.

3205711161 is the 28310-th centered octagonal number.

It is an amenable number.

3205711161 is a deficient number, since it is larger than the sum of its proper divisors (1623554518).

3205711161 is an frugal number, since it uses more digits than its factorization.

3205711161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496 (or 236 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The cubic root of 3205711161 is about 1474.4887491393.

Adding to 3205711161 its reverse (1611175023), we get a palindrome (4816886184).

The spelling of 3205711161 in words is "three billion, two hundred five million, seven hundred eleven thousand, one hundred sixty-one".