25312505 has 8 divisors (see below), whose sum is σ = 31422600. Its totient is φ = 19551616.

The previous prime is 25312501. The next prime is 25312513. The reversal of 25312505 is 50521352.

It can be written as a sum of positive squares in 4 ways, for example, as 2920681 + 22391824 = 1709^2 + 4732^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25312505 - 2² = 25312501 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25312501) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 87140 + ... + 87429.

It is an arithmetic number, because the mean of its divisors is an integer number (3927825).

Almost surely, 2^25312505 is an apocalyptic number.

It is an amenable number.

25312505 is a deficient number, since it is larger than the sum of its proper divisors (6110095).

25312505 is a wasteful number, since it uses less digits than its factorization.

25312505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174603.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 25312505 is about 5031.1534462785. The cubic root of 25312505 is about 293.6150924203.

Adding to 25312505 its reverse (50521352), we get a palindrome (75833857).

The spelling of 25312505 in words is "twenty-five million, three hundred twelve thousand, five hundred five".