61725641 has 2 divisors, whose sum is σ = 61725642. Its totient is φ = 61725640.

The previous prime is 61725611. The next prime is 61725679. The reversal of 61725641 is 14652716.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60295225 + 1430416 = 7765^2 + 1196^2 .

It is a cyclic number.

It is not a de Polignac number, because 61725641 - 2⁶ = 61725577 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61725598 and 61725607.

It is not a weakly prime, because it can be changed into another prime (61725611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30862820 + 30862821.

It is an arithmetic number, because the mean of its divisors is an integer number (30862821).

Almost surely, 2^61725641 is an apocalyptic number.

It is an amenable number.

61725641 is a deficient number, since it is larger than the sum of its proper divisors (1).

61725641 is an equidigital number, since it uses as much as digits as its factorization.

61725641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 32.

The square root of 61725641 is about 7856.5667438137. The cubic root of 61725641 is about 395.2044895359.

The spelling of 61725641 in words is "sixty-one million, seven hundred twenty-five thousand, six hundred forty-one".