547661 has 2 divisors, whose sum is σ = 547662. Its totient is φ = 547660.

The previous prime is 547643. The next prime is 547663. The reversal of 547661 is 166745.

547661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 372100 + 175561 = 610^2 + 419^2 .

It is a cyclic number.

It is not a de Polignac number, because 547661 - 2¹⁸ = 285517 is a prime.

Together with 547663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 547661.

It is not a weakly prime, because it can be changed into another prime (547663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 273830 + 273831.

It is an arithmetic number, because the mean of its divisors is an integer number (273831).

2⁵⁴⁷⁶⁶¹ is an apocalyptic number.

It is an amenable number.

547661 is a deficient number, since it is larger than the sum of its proper divisors (1).

547661 is an equidigital number, since it uses as much as digits as its factorization.

547661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 29.

The square root of 547661 is about 740.0412150685. The cubic root of 547661 is about 81.8158170285.

The spelling of 547661 in words is "five hundred forty-seven thousand, six hundred sixty-one".