25809457 has 2 divisors, whose sum is σ = 25809458. Its totient is φ = 25809456.

The previous prime is 25809437. The next prime is 25809479. The reversal of 25809457 is 75490852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25765776 + 43681 = 5076^2 + 209^2 .

It is a cyclic number.

It is not a de Polignac number, because 25809457 - 2¹⁵ = 25776689 is a prime.

It is a super-2 number, since 2×25809457² = 1332256141269698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25809437) 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 as a sum of consecutive naturals, namely, 12904728 + 12904729.

It is an arithmetic number, because the mean of its divisors is an integer number (12904729).

Almost surely, 2^25809457 is an apocalyptic number.

It is an amenable number.

25809457 is a deficient number, since it is larger than the sum of its proper divisors (1).

25809457 is an equidigital number, since it uses as much as digits as its factorization.

25809457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 25809457 is about 5080.3008769166. The cubic root of 25809457 is about 295.5241357095.

The spelling of 25809457 in words is "twenty-five million, eight hundred nine thousand, four hundred fifty-seven".