25781133 has 16 divisors (see below), whose sum is σ = 39495296. Its totient is φ = 14653440.

The previous prime is 25781117. The next prime is 25781143. The reversal of 25781133 is 33118752.

It is not a de Polignac number, because 25781133 - 2⁴ = 25781117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25781133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25781143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 873 + ... + 7233.

It is an arithmetic number, because the mean of its divisors is an integer number (2468456).

Almost surely, 2^25781133 is an apocalyptic number.

It is an amenable number.

25781133 is a deficient number, since it is larger than the sum of its proper divisors (13714163).

25781133 is a wasteful number, since it uses less digits than its factorization.

25781133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6564.

The product of its digits is 5040, while the sum is 30.

The square root of 25781133 is about 5077.5124815208. The cubic root of 25781133 is about 295.4159907317.

Adding to 25781133 its reverse (33118752), we get a palindrome (58899885).

The spelling of 25781133 in words is "twenty-five million, seven hundred eighty-one thousand, one hundred thirty-three".