601556561 has 2 divisors, whose sum is σ = 601556562. Its totient is φ = 601556560.

The previous prime is 601556537. The next prime is 601556597. The reversal of 601556561 is 165655106.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 567916561 + 33640000 = 23831^2 + 5800^2 .

It is a cyclic number.

It is not a de Polignac number, because 601556561 - 2⁶ = 601556497 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (601556521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 300778280 + 300778281.

It is an arithmetic number, because the mean of its divisors is an integer number (300778281).

Almost surely, 2^601556561 is an apocalyptic number.

It is an amenable number.

601556561 is a deficient number, since it is larger than the sum of its proper divisors (1).

601556561 is an equidigital number, since it uses as much as digits as its factorization.

601556561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 601556561 is about 24526.6500158501. The cubic root of 601556561 is about 844.1613990393.

The spelling of 601556561 in words is "six hundred one million, five hundred fifty-six thousand, five hundred sixty-one".