2649161 has 4 divisors (see below), whose sum is σ = 2805012. Its totient is φ = 2493312.

The previous prime is 2649139. The next prime is 2649173. The reversal of 2649161 is 1619462.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1254400 + 1394761 = 1120^2 + 1181^2 .

It is a cyclic number.

It is not a de Polignac number, because 2649161 - 2¹⁰ = 2648137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2643161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77900 + ... + 77933.

It is an arithmetic number, because the mean of its divisors is an integer number (701253).

2^2649161 is an apocalyptic number.

It is an amenable number.

2649161 is a deficient number, since it is larger than the sum of its proper divisors (155851).

2649161 is a wasteful number, since it uses less digits than its factorization.

2649161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155850.

The product of its digits is 2592, while the sum is 29.

The square root of 2649161 is about 1627.6243424083. The cubic root of 2649161 is about 138.3681446559.

The spelling of 2649161 in words is "two million, six hundred forty-nine thousand, one hundred sixty-one".