25521001 has 4 divisors (see below), whose sum is σ = 27841104. Its totient is φ = 23200900.

The previous prime is 25520993. The next prime is 25521011. The reversal of 25521001 is 10012552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25521001 - 2³ = 25520993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25521011) 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, 1160035 + ... + 1160056.

It is an arithmetic number, because the mean of its divisors is an integer number (6960276).

Almost surely, 2^25521001 is an apocalyptic number.

It is an amenable number.

25521001 is a deficient number, since it is larger than the sum of its proper divisors (2320103).

25521001 is a wasteful number, since it uses less digits than its factorization.

25521001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2320102.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 25521001 is about 5051.8314500783. The cubic root of 25521001 is about 294.4190462594.

Adding to 25521001 its reverse (10012552), we get a palindrome (35533553).

It can be divided in two parts, 2552 and 1001, that multiplied together give a palindrome (2554552).

The spelling of 25521001 in words is "twenty-five million, five hundred twenty-one thousand, one".