256122025 has 6 divisors (see below), whose sum is σ = 317591342. Its totient is φ = 204897600.

The previous prime is 256122019. The next prime is 256122049. The reversal of 256122025 is 520221652.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 36252441 + 219869584 = 6021^2 + 14828^2 .

It is not a de Polignac number, because 256122025 - 2⁷ = 256121897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 10244881 = 256122025 / (2 + 5 + 6 + 1 + 2 + 2 + 0 + 2 + 5).

It is a Duffinian number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 5122416 + ... + 5122465.

Almost surely, 2^256122025 is an apocalyptic number.

256122025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256122025 is a deficient number, since it is larger than the sum of its proper divisors (61469317).

256122025 is a wasteful number, since it uses less digits than its factorization.

256122025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10244891 (or 10244886 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 256122025 is about 16003.8128269485. The cubic root of 256122025 is about 635.0612915397.

Adding to 256122025 its reverse (520221652), we get a palindrome (776343677).

The spelling of 256122025 in words is "two hundred fifty-six million, one hundred twenty-two thousand, twenty-five".