274559561 has 2 divisors, whose sum is σ = 274559562. Its totient is φ = 274559560.

The previous prime is 274559543. The next prime is 274559563. The reversal of 274559561 is 165955472.

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., 273703936 + 855625 = 16544^2 + 925^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-274559561 is a prime.

Together with 274559563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (274559563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137279780 + 137279781.

It is an arithmetic number, because the mean of its divisors is an integer number (137279781).

Almost surely, 2^274559561 is an apocalyptic number.

It is an amenable number.

274559561 is a deficient number, since it is larger than the sum of its proper divisors (1).

274559561 is an equidigital number, since it uses as much as digits as its factorization.

274559561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 378000, while the sum is 44.

The square root of 274559561 is about 16569.8388948113. The cubic root of 274559561 is about 649.9483674963.

The spelling of 274559561 in words is "two hundred seventy-four million, five hundred fifty-nine thousand, five hundred sixty-one".