25905515 has 4 divisors (see below), whose sum is σ = 31086624. Its totient is φ = 20724408.

The previous prime is 25905469. The next prime is 25905533. The reversal of 25905515 is 51550952.

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 25905515 - 2⁸ = 25905259 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2590547 + ... + 2590556.

It is an arithmetic number, because the mean of its divisors is an integer number (7771656).

Almost surely, 2^25905515 is an apocalyptic number.

25905515 is a deficient number, since it is larger than the sum of its proper divisors (5181109).

25905515 is an equidigital number, since it uses as much as digits as its factorization.

25905515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5181108.

The product of its (nonzero) digits is 11250, while the sum is 32.

The square root of 25905515 is about 5089.7460643926. The cubic root of 25905515 is about 295.8903104345.

The spelling of 25905515 in words is "twenty-five million, nine hundred five thousand, five hundred fifteen".