225281261 has 2 divisors, whose sum is σ = 225281262. Its totient is φ = 225281260.

The previous prime is 225281237. The next prime is 225281299. The reversal of 225281261 is 162182522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141467236 + 83814025 = 11894^2 + 9155^2 .

It is a cyclic number.

It is not a de Polignac number, because 225281261 - 2¹⁸ = 225019117 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225281201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112640630 + 112640631.

It is an arithmetic number, because the mean of its divisors is an integer number (112640631).

Almost surely, 2^225281261 is an apocalyptic number.

It is an amenable number.

225281261 is a deficient number, since it is larger than the sum of its proper divisors (1).

225281261 is an equidigital number, since it uses as much as digits as its factorization.

225281261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 29.

The square root of 225281261 is about 15009.3724385798. The cubic root of 225281261 is about 608.4735290235.

The spelling of 225281261 in words is "two hundred twenty-five million, two hundred eighty-one thousand, two hundred sixty-one".