25042509 has 6 divisors (see below), whose sum is σ = 36172526. Its totient is φ = 16695000.

The previous prime is 25042499. The next prime is 25042519. The reversal of 25042509 is 90524052.

It is an interprime number because it is at equal distance from previous prime (25042499) and next prime (25042519).

It can be written as a sum of positive squares in only one way, i.e., 12638025 + 12404484 = 3555^2 + 3522^2 .

It is not a de Polignac number, because 25042509 - 2⁵ = 25042477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25042519) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1391242 + ... + 1391259.

Almost surely, 2^25042509 is an apocalyptic number.

It is an amenable number.

25042509 is a deficient number, since it is larger than the sum of its proper divisors (11130017).

25042509 is a wasteful number, since it uses less digits than its factorization.

25042509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2782507 (or 2782504 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 25042509 is about 5004.2490945196. The cubic root of 25042509 is about 292.5674094034.

The spelling of 25042509 in words is "twenty-five million, forty-two thousand, five hundred nine".