25872521 has 4 divisors (see below), whose sum is σ = 27394452. Its totient is φ = 24350592.

The previous prime is 25872461. The next prime is 25872523. The reversal of 25872521 is 12527852.

It is a happy number.

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 22848400 + 3024121 = 4780^2 + 1739^2 .

It is a cyclic number.

It is not a de Polignac number, because 25872521 - 2¹⁰ = 25871497 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25872523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 760940 + ... + 760973.

It is an arithmetic number, because the mean of its divisors is an integer number (6848613).

Almost surely, 2^25872521 is an apocalyptic number.

It is an amenable number.

25872521 is a deficient number, since it is larger than the sum of its proper divisors (1521931).

25872521 is a wasteful number, since it uses less digits than its factorization.

25872521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521930.

The product of its digits is 11200, while the sum is 32.

The square root of 25872521 is about 5086.5038091011. The cubic root of 25872521 is about 295.7646389641.

The spelling of 25872521 in words is "twenty-five million, eight hundred seventy-two thousand, five hundred twenty-one".