25601521 has 8 divisors (see below), whose sum is σ = 28684224. Its totient is φ = 22644720.

The previous prime is 25601509. The next prime is 25601533. The reversal of 25601521 is 12510652.

It is an interprime number because it is at equal distance from previous prime (25601509) and next prime (25601533).

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 25601521 - 2⁵ = 25601489 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25601492 and 25601501.

It is not an unprimeable number, because it can be changed into a prime (25601561) 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 7 ways as a sum of consecutive naturals, for example, 31045 + ... + 31858.

It is an arithmetic number, because the mean of its divisors is an integer number (3585528).

Almost surely, 2^25601521 is an apocalyptic number.

It is an amenable number.

25601521 is a deficient number, since it is larger than the sum of its proper divisors (3082703).

25601521 is a wasteful number, since it uses less digits than its factorization.

25601521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62951.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 25601521 is about 5059.7945610469. The cubic root of 25601521 is about 294.7283566630.

It can be divided in two parts, 256015 and 21, that added together give a square (256036 = 506²).

The spelling of 25601521 in words is "twenty-five million, six hundred one thousand, five hundred twenty-one".