2081601 has 6 divisors (see below), whose sum is σ = 3006770. Its totient is φ = 1387728.

The previous prime is 2081581. The next prime is 2081603. The reversal of 2081601 is 1061802.

It can be written as a sum of positive squares in only one way, i.e., 1440000 + 641601 = 1200^2 + 801^2 .

It is not a de Polignac number, because 2081601 - 2⁶ = 2081537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2081603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 115636 + ... + 115653.

2^2081601 is an apocalyptic number.

It is an amenable number.

2081601 is a deficient number, since it is larger than the sum of its proper divisors (925169).

2081601 is a wasteful number, since it uses less digits than its factorization.

2081601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231295 (or 231292 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 2081601 is about 1442.7754503040. The cubic root of 2081601 is about 127.6828288258.

The spelling of 2081601 in words is "two million, eighty-one thousand, six hundred one".