25400081 has 12 divisors (see below), whose sum is σ = 29676708. Its totient is φ = 21676032.

The previous prime is 25400071. The next prime is 25400083. The reversal of 25400081 is 18000452.

It can be written as a sum of positive squares in 2 ways, for example, as 23668225 + 1731856 = 4865^2 + 1316^2 .

It is a de Polignac number, because none of the positive numbers 2^k-25400081 is a prime.

It is a super-2 number, since 2×25400081² = 1290328229613122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25400083) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11585 + ... + 13601.

It is an arithmetic number, because the mean of its divisors is an integer number (2473059).

Almost surely, 2^25400081 is an apocalyptic number.

It is an amenable number.

25400081 is a deficient number, since it is larger than the sum of its proper divisors (4276627).

25400081 is a wasteful number, since it uses less digits than its factorization.

25400081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2288 (or 2281 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 25400081 is about 5039.8493033026. The cubic root of 25400081 is about 293.9533183630.

The spelling of 25400081 in words is "twenty-five million, four hundred thousand, eighty-one".