25641081 has 6 divisors (see below), whose sum is σ = 37037130. Its totient is φ = 17094048.

The previous prime is 25641079. The next prime is 25641103. The reversal of 25641081 is 18014652.

It can be written as a sum of positive squares in only one way, i.e., 19184400 + 6456681 = 4380^2 + 2541^2 .

It is not a de Polignac number, because 25641081 - 2¹ = 25641079 is a prime.

It is a super-2 number, since 2×25641081² = 1314930069697122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25641181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1424496 + ... + 1424513.

It is an arithmetic number, because the mean of its divisors is an integer number (6172855).

Almost surely, 2^25641081 is an apocalyptic number.

It is an amenable number.

25641081 is a deficient number, since it is larger than the sum of its proper divisors (11396049).

25641081 is a wasteful number, since it uses less digits than its factorization.

25641081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2849015 (or 2849012 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 25641081 is about 5063.7023016761. The cubic root of 25641081 is about 294.8800853235.

The spelling of 25641081 in words is "twenty-five million, six hundred forty-one thousand, eighty-one".