25718131 has 4 divisors (see below), whose sum is σ = 26028072. Its totient is φ = 25408192.

The previous prime is 25718129. The next prime is 25718141. The reversal of 25718131 is 13181752.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25718131 - 2¹ = 25718129 is a prime.

It is a super-2 number, since 2×25718131² = 1322844524266322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25718131.

It is not an unprimeable number, because it can be changed into a prime (25718141) 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, 154846 + ... + 155011.

It is an arithmetic number, because the mean of its divisors is an integer number (6507018).

Almost surely, 2^25718131 is an apocalyptic number.

25718131 is a deficient number, since it is larger than the sum of its proper divisors (309941).

25718131 is an equidigital number, since it uses as much as digits as its factorization.

25718131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309940.

The product of its digits is 1680, while the sum is 28.

The square root of 25718131 is about 5071.3046644823. The cubic root of 25718131 is about 295.1751559635.

Adding to 25718131 its reverse (13181752), we get a palindrome (38899883).

The spelling of 25718131 in words is "twenty-five million, seven hundred eighteen thousand, one hundred thirty-one".