2509699649 has 2 divisors, whose sum is σ = 2509699650. Its totient is φ = 2509699648.

The previous prime is 2509699597. The next prime is 2509699651. The reversal of 2509699649 is 9469969052.

2509699649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2413953424 + 95746225 = 49132^2 + 9785^2 .

It is a cyclic number.

It is not a de Polignac number, because 2509699649 - 2²⁴ = 2492922433 is a prime.

Together with 2509699651, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2509699679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1254849824 + 1254849825.

It is an arithmetic number, because the mean of its divisors is an integer number (1254849825).

Almost surely, 2^2509699649 is an apocalyptic number.

It is an amenable number.

2509699649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2509699649 is an equidigital number, since it uses as much as digits as its factorization.

2509699649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9447840, while the sum is 59.

The square root of 2509699649 is about 50096.9025888827. The cubic root of 2509699649 is about 1358.9618029986.

The spelling of 2509699649 in words is "two billion, five hundred nine million, six hundred ninety-nine thousand, six hundred forty-nine".