1601000161 has 2 divisors, whose sum is σ = 1601000162. Its totient is φ = 1601000160.

The previous prime is 1601000153. The next prime is 1601000183. The reversal of 1601000161 is 1610001061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1081160161 + 519840000 = 32881^2 + 22800^2 .

It is a cyclic number.

It is not a de Polignac number, because 1601000161 - 2³ = 1601000153 is a prime.

It is not a weakly prime, because it can be changed into another prime (1601000111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800500080 + 800500081.

It is an arithmetic number, because the mean of its divisors is an integer number (800500081).

Almost surely, 2^1601000161 is an apocalyptic number.

It is an amenable number.

1601000161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601000161 is an equidigital number, since it uses as much as digits as its factorization.

1601000161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 1601000161 is about 40012.5000593565. The cubic root of 1601000161 is about 1169.8507518977.

The spelling of 1601000161 in words is "one billion, six hundred one million, one hundred sixty-one", and thus it is an aban number.