256081225 has 12 divisors (see below), whose sum is σ = 318784284. Its totient is φ = 204062720.

The previous prime is 256081219. The next prime is 256081253. The reversal of 256081225 is 522180652.

It can be written as a sum of positive squares in 6 ways, for example, as 59043856 + 197037369 = 7684^2 + 14037^2 .

It is not a de Polignac number, because 256081225 - 2¹³ = 256073033 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13504 + ... + 26353.

It is an arithmetic number, because the mean of its divisors is an integer number (26565357).

Almost surely, 2^256081225 is an apocalyptic number.

256081225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256081225 is a deficient number, since it is larger than the sum of its proper divisors (62703059).

256081225 is a wasteful number, since it uses less digits than its factorization.

256081225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40124 (or 40119 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 256081225 is about 16002.5380799422. The cubic root of 256081225 is about 635.0275681916.

The spelling of 256081225 in words is "two hundred fifty-six million, eighty-one thousand, two hundred twenty-five".