25641309 has 16 divisors (see below), whose sum is σ = 35449344. Its totient is φ = 16468800.

The previous prime is 25641293. The next prime is 25641313. The reversal of 25641309 is 90314652.

It is not a de Polignac number, because 25641309 - 2⁴ = 25641293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25641509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26779 + ... + 27719.

It is an arithmetic number, because the mean of its divisors is an integer number (2215584).

Almost surely, 2^25641309 is an apocalyptic number.

It is an amenable number.

25641309 is a deficient number, since it is larger than the sum of its proper divisors (9808035).

25641309 is a wasteful number, since it uses less digits than its factorization.

25641309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1268.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 25641309 is about 5063.7248147979. The cubic root of 25641309 is about 294.8809593436.

The spelling of 25641309 in words is "twenty-five million, six hundred forty-one thousand, three hundred nine".