1605156161 has 12 divisors (see below), whose sum is σ = 1927457280. Its totient is φ = 1331464680.

The previous prime is 1605156149. The next prime is 1605156181. The reversal of 1605156161 is 1616515061.

It is a de Polignac number, because none of the positive numbers 2^k-1605156161 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1605156181) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 526841 + ... + 529878.

It is an arithmetic number, because the mean of its divisors is an integer number (160621440).

Almost surely, 2^1605156161 is an apocalyptic number.

It is an amenable number.

1605156161 is a deficient number, since it is larger than the sum of its proper divisors (322301119).

1605156161 is a wasteful number, since it uses less digits than its factorization.

1605156161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056764 (or 1056757 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 1605156161 is about 40064.4001702259. The cubic root of 1605156161 is about 1170.8621402649.

The spelling of 1605156161 in words is "one billion, six hundred five million, one hundred fifty-six thousand, one hundred sixty-one".