25855117 has 2 divisors, whose sum is σ = 25855118. Its totient is φ = 25855116.

The previous prime is 25855111. The next prime is 25855121. The reversal of 25855117 is 71155852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25260676 + 594441 = 5026^2 + 771^2 .

It is a cyclic number.

It is not a de Polignac number, because 25855117 - 2⁷ = 25854989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25855111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12927558 + 12927559.

It is an arithmetic number, because the mean of its divisors is an integer number (12927559).

Almost surely, 2^25855117 is an apocalyptic number.

It is an amenable number.

25855117 is a deficient number, since it is larger than the sum of its proper divisors (1).

25855117 is an equidigital number, since it uses as much as digits as its factorization.

25855117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14000, while the sum is 34.

The square root of 25855117 is about 5084.7927194724. The cubic root of 25855117 is about 295.6983054924.

The spelling of 25855117 in words is "twenty-five million, eight hundred fifty-five thousand, one hundred seventeen".