25642481 has 4 divisors (see below), whose sum is σ = 25730292. Its totient is φ = 25554672.

The previous prime is 25642471. The next prime is 25642483. The reversal of 25642481 is 18424652.

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 13075456 + 12567025 = 3616^2 + 3545^2 .

It is a cyclic number.

It is not a de Polignac number, because 25642481 - 2⁶ = 25642417 is a prime.

It is a super-2 number, since 2×25642481² = 1315073663670722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25642483) 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, 43466 + ... + 44051.

It is an arithmetic number, because the mean of its divisors is an integer number (6432573).

Almost surely, 2^25642481 is an apocalyptic number.

It is an amenable number.

25642481 is a deficient number, since it is larger than the sum of its proper divisors (87811).

25642481 is an equidigital number, since it uses as much as digits as its factorization.

25642481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87810.

The product of its digits is 15360, while the sum is 32.

The square root of 25642481 is about 5063.8405385636. The cubic root of 25642481 is about 294.8854520318.

The spelling of 25642481 in words is "twenty-five million, six hundred forty-two thousand, four hundred eighty-one".