25555081 has 2 divisors, whose sum is σ = 25555082. Its totient is φ = 25555080.

The previous prime is 25555069. The next prime is 25555091. The reversal of 25555081 is 18055552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13995081 + 11560000 = 3741^2 + 3400^2 .

It is a cyclic number.

It is not a de Polignac number, because 25555081 - 2⁹ = 25554569 is a prime.

It is a super-2 number, since 2×25555081² = 1306124329833122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25555031) 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, 12777540 + 12777541.

It is an arithmetic number, because the mean of its divisors is an integer number (12777541).

Almost surely, 2^25555081 is an apocalyptic number.

It is an amenable number.

25555081 is a deficient number, since it is larger than the sum of its proper divisors (1).

25555081 is an equidigital number, since it uses as much as digits as its factorization.

25555081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10000, while the sum is 31.

The square root of 25555081 is about 5055.2033589164. The cubic root of 25555081 is about 294.5500408355.

The spelling of 25555081 in words is "twenty-five million, five hundred fifty-five thousand, eighty-one".