2649761 has 6 divisors (see below), whose sum is σ = 2770530. Its totient is φ = 2534048.

The previous prime is 2649733. The next prime is 2649769. The reversal of 2649761 is 1679462.

It can be written as a sum of positive squares in only one way, i.e., 2235025 + 414736 = 1495^2 + 644^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2649761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2649769) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1976 + ... + 3033.

It is an arithmetic number, because the mean of its divisors is an integer number (461755).

2^2649761 is an apocalyptic number.

It is an amenable number.

2649761 is a deficient number, since it is larger than the sum of its proper divisors (120769).

2649761 is an equidigital number, since it uses as much as digits as its factorization.

2649761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5055 (or 5032 counting only the distinct ones).

The product of its digits is 18144, while the sum is 35.

The square root of 2649761 is about 1627.8086496883. The cubic root of 2649761 is about 138.3785900535.

Subtracting from 2649761 its reverse (1679462), we obtain a cube (970299 = 99³).

The spelling of 2649761 in words is "two million, six hundred forty-nine thousand, seven hundred sixty-one".