25130521 has 16 divisors (see below), whose sum is σ = 28909440. Its totient is φ = 21651840.

The previous prime is 25130509. The next prime is 25130527. The reversal of 25130521 is 12503152.

It is a cyclic number.

It is not a de Polignac number, because 25130521 - 2⁷ = 25130393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25130527) 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, 16821 + ... + 18253.

It is an arithmetic number, because the mean of its divisors is an integer number (1806840).

Almost surely, 2^25130521 is an apocalyptic number.

It is an amenable number.

25130521 is a deficient number, since it is larger than the sum of its proper divisors (3778919).

25130521 is a wasteful number, since it uses less digits than its factorization.

25130521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 25130521 is about 5013.0351085944. The cubic root of 25130521 is about 292.9097517793.

Adding to 25130521 its reverse (12503152), we get a palindrome (37633673).

It can be divided in two parts, 25130 and 521, that added together give a triangular number (25651 = T₂₂₆).

The spelling of 25130521 in words is "twenty-five million, one hundred thirty thousand, five hundred twenty-one".