25421617 has 4 divisors (see below), whose sum is σ = 27377140. Its totient is φ = 23466096.

The previous prime is 25421611. The next prime is 25421629. The reversal of 25421617 is 71612452.

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 14930496 + 10491121 = 3864^2 + 3239^2 .

It is a cyclic number.

It is not a de Polignac number, because 25421617 - 2¹⁹ = 24897329 is a prime.

It is a super-2 number, since 2×25421617² = 1292517221789378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25421611) 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, 977742 + ... + 977767.

It is an arithmetic number, because the mean of its divisors is an integer number (6844285).

Almost surely, 2^25421617 is an apocalyptic number.

It is an amenable number.

25421617 is a deficient number, since it is larger than the sum of its proper divisors (1955523).

25421617 is a wasteful number, since it uses less digits than its factorization.

25421617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1955522.

The product of its digits is 3360, while the sum is 28.

The square root of 25421617 is about 5041.9854224303. The cubic root of 25421617 is about 294.0363730894.

The spelling of 25421617 in words is "twenty-five million, four hundred twenty-one thousand, six hundred seventeen".