61561025 has 12 divisors (see below), whose sum is σ = 76809072. Its totient is φ = 48943440.

The previous prime is 61561001. The next prime is 61561051. The reversal of 61561025 is 52016516.

61561025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61561025 - 2⁸ = 61560769 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61560985 and 61561003.

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, 3479 + ... + 11628.

It is an arithmetic number, because the mean of its divisors is an integer number (6400756).

Almost surely, 2^61561025 is an apocalyptic number.

It is an amenable number.

61561025 is a deficient number, since it is larger than the sum of its proper divisors (15248047).

61561025 is a wasteful number, since it uses less digits than its factorization.

61561025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15280 (or 15275 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 61561025 is about 7846.0834178589. The cubic root of 61561025 is about 394.8528533791.

The spelling of 61561025 in words is "sixty-one million, five hundred sixty-one thousand, twenty-five".