227561 has 2 divisors, whose sum is σ = 227562. Its totient is φ = 227560.

The previous prime is 227537. The next prime is 227567. The reversal of 227561 is 165722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225625 + 1936 = 475^2 + 44^2 .

It is a cyclic number.

It is not a de Polignac number, because 227561 - 2⁶ = 227497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (227567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 113780 + 113781.

It is an arithmetic number, because the mean of its divisors is an integer number (113781).

2²²⁷⁵⁶¹ is an apocalyptic number.

It is an amenable number.

227561 is a deficient number, since it is larger than the sum of its proper divisors (1).

227561 is an equidigital number, since it uses as much as digits as its factorization.

227561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 23.

The square root of 227561 is about 477.0335417976. The cubic root of 227561 is about 61.0519131667.

The spelling of 227561 in words is "two hundred twenty-seven thousand, five hundred sixty-one".