25140509 has 4 divisors (see below), whose sum is σ = 25725216. Its totient is φ = 24555804.

The previous prime is 25140499. The next prime is 25140517. The reversal of 25140509 is 90504152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25140509 - 2¹² = 25136413 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 (25140589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 292289 + ... + 292374.

It is an arithmetic number, because the mean of its divisors is an integer number (6431304).

Almost surely, 2^25140509 is an apocalyptic number.

It is an amenable number.

25140509 is a deficient number, since it is larger than the sum of its proper divisors (584707).

25140509 is an equidigital number, since it uses as much as digits as its factorization.

25140509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584706.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 25140509 is about 5014.0312125076. The cubic root of 25140509 is about 292.9485518119.

The spelling of 25140509 in words is "twenty-five million, one hundred forty thousand, five hundred nine".