25312515 has 16 divisors (see below), whose sum is σ = 40682400. Its totient is φ = 13439232.

The previous prime is 25312513. The next prime is 25312517. The reversal of 25312515 is 51521352.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25312513) and next prime (25312517).

It is not a de Polignac number, because 25312515 - 2¹ = 25312513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25312513) 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, 250 + ... + 7119.

It is an arithmetic number, because the mean of its divisors is an integer number (2542650).

Almost surely, 2^25312515 is an apocalyptic number.

25312515 is a deficient number, since it is larger than the sum of its proper divisors (15369885).

25312515 is a wasteful number, since it uses less digits than its factorization.

25312515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7606.

The product of its digits is 1500, while the sum is 24.

The square root of 25312515 is about 5031.1544400863. The cubic root of 25312515 is about 293.6151310857.

Adding to 25312515 its reverse (51521352), we get a palindrome (76833867).

The spelling of 25312515 in words is "twenty-five million, three hundred twelve thousand, five hundred fifteen".