25081521 has 16 divisors (see below), whose sum is σ = 34062336. Its totient is φ = 16413776.

The previous prime is 25081499. The next prime is 25081541. The reversal of 25081521 is 12518052.

It is a cyclic number.

It is not a de Polignac number, because 25081521 - 2⁵ = 25081489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25081491 and 25081500.

It is not an unprimeable number, because it can be changed into a prime (25081541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65296 + ... + 65678.

It is an arithmetic number, because the mean of its divisors is an integer number (2128896).

Almost surely, 2^25081521 is an apocalyptic number.

It is an amenable number.

25081521 is a deficient number, since it is larger than the sum of its proper divisors (8980815).

25081521 is a wasteful number, since it uses less digits than its factorization.

25081521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732.

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 25081521 is about 5008.1454651398. The cubic root of 25081521 is about 292.7192541202.

Adding to 25081521 its reverse (12518052), we get a palindrome (37599573).

The spelling of 25081521 in words is "twenty-five million, eighty-one thousand, five hundred twenty-one".