25261517 has 4 divisors (see below), whose sum is σ = 25282236. Its totient is φ = 25240800.

The previous prime is 25261501. The next prime is 25261543. The reversal of 25261517 is 71516252.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51076 + 25210441 = 226^2 + 5021^2 .

It is a cyclic number.

It is not a de Polignac number, because 25261517 - 2⁴ = 25261501 is a prime.

It is a super-2 number, since 2×25261517² = 1276288482282578, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25261517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25261547) 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 3 ways as a sum of consecutive naturals, for example, 8408 + ... + 11009.

It is an arithmetic number, because the mean of its divisors is an integer number (6320559).

Almost surely, 2^25261517 is an apocalyptic number.

It is an amenable number.

25261517 is a deficient number, since it is larger than the sum of its proper divisors (20719).

25261517 is a wasteful number, since it uses less digits than its factorization.

25261517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20718.

The product of its digits is 4200, while the sum is 29.

The square root of 25261517 is about 5026.0836642460. The cubic root of 25261517 is about 293.4178129897.

Adding to 25261517 its reverse (71516252), we get a palindrome (96777769).

The spelling of 25261517 in words is "twenty-five million, two hundred sixty-one thousand, five hundred seventeen".