544609561 has 2 divisors, whose sum is σ = 544609562. Its totient is φ = 544609560.

The previous prime is 544609537. The next prime is 544609573. The reversal of 544609561 is 165906445.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 474368400 + 70241161 = 21780^2 + 8381^2 .

It is a cyclic number.

It is not a de Polignac number, because 544609561 - 2⁹ = 544609049 is a prime.

It is a super-2 number, since 2×544609561² = 593199147865225442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (544609361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272304780 + 272304781.

It is an arithmetic number, because the mean of its divisors is an integer number (272304781).

Almost surely, 2^544609561 is an apocalyptic number.

It is an amenable number.

544609561 is a deficient number, since it is larger than the sum of its proper divisors (1).

544609561 is an equidigital number, since it uses as much as digits as its factorization.

544609561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 544609561 is about 23336.8712770157. The cubic root of 544609561 is about 816.6358107089.

The spelling of 544609561 in words is "five hundred forty-four million, six hundred nine thousand, five hundred sixty-one".