2509825 has 6 divisors (see below), whose sum is σ = 3112214. Its totient is φ = 2007840.

The previous prime is 2509823. The next prime is 2509831. The reversal of 2509825 is 5289052.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 147456 + 2362369 = 384^2 + 1537^2 .

It is not a de Polignac number, because 2509825 - 2¹ = 2509823 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2509823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50172 + ... + 50221.

2^2509825 is an apocalyptic number.

2509825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2509825 is a deficient number, since it is larger than the sum of its proper divisors (602389).

2509825 is a wasteful number, since it uses less digits than its factorization.

2509825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100403 (or 100398 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 2509825 is about 1584.2427213025. The cubic root of 2509825 is about 135.8984427802.

The spelling of 2509825 in words is "two million, five hundred nine thousand, eight hundred twenty-five".