25361521 has 4 divisors (see below), whose sum is σ = 25472500. Its totient is φ = 25250544.

The previous prime is 25361513. The next prime is 25361527. The reversal of 25361521 is 12516352.

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 23658496 + 1703025 = 4864^2 + 1305^2 .

It is a cyclic number.

It is not a de Polignac number, because 25361521 - 2³ = 25361513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25361527) 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, 55146 + ... + 55603.

It is an arithmetic number, because the mean of its divisors is an integer number (6368125).

Almost surely, 2^25361521 is an apocalyptic number.

It is an amenable number.

25361521 is a deficient number, since it is larger than the sum of its proper divisors (110979).

25361521 is a wasteful number, since it uses less digits than its factorization.

25361521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110978.

The product of its digits is 1800, while the sum is 25.

The square root of 25361521 is about 5036.0223391085. The cubic root of 25361521 is about 293.8044923202.

Adding to 25361521 its reverse (12516352), we get a palindrome (37877873).

The spelling of 25361521 in words is "twenty-five million, three hundred sixty-one thousand, five hundred twenty-one".