2601649 has 4 divisors (see below), whose sum is σ = 2608420. Its totient is φ = 2594880.

The previous prime is 2601617. The next prime is 2601661. The reversal of 2601649 is 9461062.

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 1587600 + 1014049 = 1260^2 + 1007^2 .

It is a cyclic number.

It is not a de Polignac number, because 2601649 - 2⁵ = 2601617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2601679) 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, 2772 + ... + 3589.

It is an arithmetic number, because the mean of its divisors is an integer number (652105).

2^2601649 is an apocalyptic number.

It is an amenable number.

2601649 is a deficient number, since it is larger than the sum of its proper divisors (6771).

2601649 is an equidigital number, since it uses as much as digits as its factorization.

2601649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6770.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 2601649 is about 1612.9628018029. The cubic root of 2601649 is about 137.5359509300.

The spelling of 2601649 in words is "two million, six hundred one thousand, six hundred forty-nine".