25391265 has 16 divisors (see below), whose sum is σ = 40754688. Its totient is φ = 13499136.

The previous prime is 25391243. The next prime is 25391297. The reversal of 25391265 is 56219352.

It is not a de Polignac number, because 25391265 - 2⁷ = 25391137 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2544 + ... + 7566.

It is an arithmetic number, because the mean of its divisors is an integer number (2547168).

Almost surely, 2^25391265 is an apocalyptic number.

It is an amenable number.

25391265 is a deficient number, since it is larger than the sum of its proper divisors (15363423).

25391265 is a wasteful number, since it uses less digits than its factorization.

25391265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5368.

The product of its digits is 16200, while the sum is 33.

The square root of 25391265 is about 5038.9745980705. The cubic root of 25391265 is about 293.9193054487.

It can be divided in two parts, 2539126 and 5, that added together give a triangular number (2539131 = T₂₂₅₃).

The spelling of 25391265 in words is "twenty-five million, three hundred ninety-one thousand, two hundred sixty-five".