2049561 has 6 divisors (see below), whose sum is σ = 2960490. Its totient is φ = 1366368.

The previous prime is 2049547. The next prime is 2049569. The reversal of 2049561 is 1659402.

It can be written as a sum of positive squares in only one way, i.e., 1904400 + 145161 = 1380^2 + 381^2 .

It is not a de Polignac number, because 2049561 - 2¹⁰ = 2048537 is a prime.

It is an Ulam number.

2049561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2049569) 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, 113856 + ... + 113873.

It is an arithmetic number, because the mean of its divisors is an integer number (493415).

2^2049561 is an apocalyptic number.

It is an amenable number.

2049561 is a deficient number, since it is larger than the sum of its proper divisors (910929).

2049561 is a wasteful number, since it uses less digits than its factorization.

2049561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227735 (or 227732 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 2049561 is about 1431.6287926694. The cubic root of 2049561 is about 127.0243407166.

The spelling of 2049561 in words is "two million, forty-nine thousand, five hundred sixty-one".