25945921 has 4 divisors (see below), whose sum is σ = 25956144. Its totient is φ = 25935700.

The previous prime is 25945919. The next prime is 25945937. The reversal of 25945921 is 12954952.

It is the 2080-th star number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25945921 - 2¹ = 25945919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25945901) 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, 1926 + ... + 7456.

It is an arithmetic number, because the mean of its divisors is an integer number (6489036).

Almost surely, 2^25945921 is an apocalyptic number.

It is an amenable number.

25945921 is a deficient number, since it is larger than the sum of its proper divisors (10223).

25945921 is an equidigital number, since it uses as much as digits as its factorization.

25945921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10222.

The product of its digits is 32400, while the sum is 37.

The square root of 25945921 is about 5093.7138710375. The cubic root of 25945921 is about 296.0440683414.

It can be divided in two parts, 2594 and 5921, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 25945921 in words is "twenty-five million, nine hundred forty-five thousand, nine hundred twenty-one".