25178225 has 6 divisors (see below), whose sum is σ = 31221030. Its totient is φ = 20142560.

The previous prime is 25178221. The next prime is 25178239. The reversal of 25178225 is 52287152.

25178225 = 542² + 543² + ... + 616².

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 58081 + 25120144 = 241^2 + 5012^2 .

It is not a de Polignac number, because 25178225 - 2² = 25178221 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25178191 and 25178200.

It is not an unprimeable number, because it can be changed into a prime (25178221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 503540 + ... + 503589.

It is an arithmetic number, because the mean of its divisors is an integer number (5203505).

Almost surely, 2^25178225 is an apocalyptic number.

25178225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25178225 is a deficient number, since it is larger than the sum of its proper divisors (6042805).

25178225 is a wasteful number, since it uses less digits than its factorization.

25178225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007139 (or 1007134 counting only the distinct ones).

The product of its digits is 11200, while the sum is 32.

The square root of 25178225 is about 5017.7908485707. The cubic root of 25178225 is about 293.0949732307.

The spelling of 25178225 in words is "twenty-five million, one hundred seventy-eight thousand, two hundred twenty-five".