25495681 has 4 divisors (see below), whose sum is σ = 25624000. Its totient is φ = 25367364.

The previous prime is 25495643. The next prime is 25495747. The reversal of 25495681 is 18659452.

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 a de Polignac number, because none of the positive numbers 2^k-25495681 is a prime.

It is a super-2 number, since 2×25495681² = 1300059499307522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25495081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63861 + ... + 64258.

It is an arithmetic number, because the mean of its divisors is an integer number (6406000).

Almost surely, 2^25495681 is an apocalyptic number.

It is an amenable number.

25495681 is a deficient number, since it is larger than the sum of its proper divisors (128319).

25495681 is a wasteful number, since it uses less digits than its factorization.

25495681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128318.

The product of its digits is 86400, while the sum is 40.

The square root of 25495681 is about 5049.3248063479. The cubic root of 25495681 is about 294.3216472984.

The spelling of 25495681 in words is "twenty-five million, four hundred ninety-five thousand, six hundred eighty-one".