727556561 has 2 divisors, whose sum is σ = 727556562. Its totient is φ = 727556560.

The previous prime is 727556549. The next prime is 727556597. The reversal of 727556561 is 165655727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 694849600 + 32706961 = 26360^2 + 5719^2 .

It is a cyclic number.

It is not a de Polignac number, because 727556561 - 2¹⁸ = 727294417 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (727556161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363778280 + 363778281.

It is an arithmetic number, because the mean of its divisors is an integer number (363778281).

Almost surely, 2^727556561 is an apocalyptic number.

It is an amenable number.

727556561 is a deficient number, since it is larger than the sum of its proper divisors (1).

727556561 is an equidigital number, since it uses as much as digits as its factorization.

727556561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 441000, while the sum is 44.

The square root of 727556561 is about 26973.2564033340. The cubic root of 727556561 is about 899.4055996989.

It can be divided in two parts, 7275 and 56561, that added together give a palindrome (63836).

The spelling of 727556561 in words is "seven hundred twenty-seven million, five hundred fifty-six thousand, five hundred sixty-one".