25715617 has 4 divisors (see below), whose sum is σ = 25742916. Its totient is φ = 25688320.

The previous prime is 25715603. The next prime is 25715639. The reversal of 25715617 is 71651752.

It is a happy number.

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 24117921 + 1597696 = 4911^2 + 1264^2 .

It is a cyclic number.

It is not a de Polignac number, because 25715617 - 2¹⁹ = 25191329 is a prime.

It is a super-2 number, since 2×25715617² = 1322585915381378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25715687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12184 + ... + 14137.

It is an arithmetic number, because the mean of its divisors is an integer number (6435729).

Almost surely, 2^25715617 is an apocalyptic number.

It is an amenable number.

25715617 is a deficient number, since it is larger than the sum of its proper divisors (27299).

25715617 is an equidigital number, since it uses as much as digits as its factorization.

25715617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27298.

The product of its digits is 14700, while the sum is 34.

The square root of 25715617 is about 5071.0567932138. The cubic root of 25715617 is about 295.1655376580.

The spelling of 25715617 in words is "twenty-five million, seven hundred fifteen thousand, six hundred seventeen".