2509651 has 4 divisors (see below), whose sum is σ = 2570904. Its totient is φ = 2448400.

The previous prime is 2509649. The next prime is 2509679. The reversal of 2509651 is 1569052.

2509651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 2509651 - 2¹ = 2509649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2509621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30565 + ... + 30646.

It is an arithmetic number, because the mean of its divisors is an integer number (642726).

2^2509651 is an apocalyptic number.

2509651 is a deficient number, since it is larger than the sum of its proper divisors (61253).

2509651 is an equidigital number, since it uses as much as digits as its factorization.

2509651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61252.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 2509651 is about 1584.1878045232. The cubic root of 2509651 is about 135.8953022059.

It can be divided in two parts, 2509 and 651, that added together give a triangular number (3160 = T₇₉).

The spelling of 2509651 in words is "two million, five hundred nine thousand, six hundred fifty-one".