2259781 has 2 divisors, whose sum is σ = 2259782. Its totient is φ = 2259780.

The previous prime is 2259769. The next prime is 2259791. The reversal of 2259781 is 1879522.

2259781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1934881 + 324900 = 1391^2 + 570^2 .

It is a cyclic number.

It is not a de Polignac number, because 2259781 - 2¹¹ = 2257733 is a prime.

It is a super-2 number, since 2×2259781² = 10213220335922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2259731) 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, 1129890 + 1129891.

It is an arithmetic number, because the mean of its divisors is an integer number (1129891).

2^2259781 is an apocalyptic number.

It is an amenable number.

2259781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2259781 is an equidigital number, since it uses as much as digits as its factorization.

2259781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 34.

The square root of 2259781 is about 1503.2567977561. The cubic root of 2259781 is about 131.2266728006.

The spelling of 2259781 in words is "two million, two hundred fifty-nine thousand, seven hundred eighty-one".