61817225 has 12 divisors (see below), whose sum is σ = 77101836. Its totient is φ = 49164480.

The previous prime is 61817207. The next prime is 61817237. The reversal of 61817225 is 52271816.

61817225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 4239481 + 57577744 = 2059^2 + 7588^2 .

It is not a de Polignac number, because 61817225 - 2⁸ = 61816969 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61817191 and 61817200.

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 11 ways as a sum of consecutive naturals, for example, 2822 + ... + 11471.

It is an arithmetic number, because the mean of its divisors is an integer number (6425153).

Almost surely, 2^61817225 is an apocalyptic number.

It is an amenable number.

61817225 is a deficient number, since it is larger than the sum of its proper divisors (15284611).

61817225 is a wasteful number, since it uses less digits than its factorization.

61817225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14476 (or 14471 counting only the distinct ones).

The product of its digits is 6720, while the sum is 32.

The square root of 61817225 is about 7862.3930835338. The cubic root of 61817225 is about 395.3998514701.

The spelling of 61817225 in words is "sixty-one million, eight hundred seventeen thousand, two hundred twenty-five".