25365521 has 8 divisors (see below), whose sum is σ = 25642344. Its totient is φ = 25090560.

The previous prime is 25365503. The next prime is 25365541. The reversal of 25365521 is 12556352.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 215296 + 25150225 = 464^2 + 5015^2 .

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 25365521 - 2¹⁰ = 25364497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25365541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63695 + ... + 64091.

It is an arithmetic number, because the mean of its divisors is an integer number (3205293).

Almost surely, 2^25365521 is an apocalyptic number.

It is an amenable number.

25365521 is a deficient number, since it is larger than the sum of its proper divisors (276823).

25365521 is a wasteful number, since it uses less digits than its factorization.

25365521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931.

The product of its digits is 9000, while the sum is 29.

The square root of 25365521 is about 5036.4194622767. The cubic root of 25365521 is about 293.8199377160.

The spelling of 25365521 in words is "twenty-five million, three hundred sixty-five thousand, five hundred twenty-one".