2509649 has 2 divisors, whose sum is σ = 2509650. Its totient is φ = 2509648.

The previous prime is 2509627. The next prime is 2509679. The reversal of 2509649 is 9469052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1392400 + 1117249 = 1180^2 + 1057^2 .

It is a cyclic number.

It is not a de Polignac number, because 2509649 - 2²⁰ = 1461073 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (2509679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1254824 + 1254825.

It is an arithmetic number, because the mean of its divisors is an integer number (1254825).

2^2509649 is an apocalyptic number.

It is an amenable number.

2509649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2509649 is an equidigital number, since it uses as much as digits as its factorization.

2509649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 2509649 is about 1584.1871732848. The cubic root of 2509649 is about 135.8952661065.

The spelling of 2509649 in words is "two million, five hundred nine thousand, six hundred forty-nine".