2261689 has 2 divisors, whose sum is σ = 2261690. Its totient is φ = 2261688.

The previous prime is 2261653. The next prime is 2261713. The reversal of 2261689 is 9861622.

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., 2190400 + 71289 = 1480^2 + 267^2 .

It is a cyclic number.

It is not a de Polignac number, because 2261689 - 2⁹ = 2261177 is a prime.

It is equal to p₁₆₆₈₉₄ and since 2261689 and 166894 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (2261639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1130844 + 1130845.

It is an arithmetic number, because the mean of its divisors is an integer number (1130845).

2^2261689 is an apocalyptic number.

It is an amenable number.

2261689 is a deficient number, since it is larger than the sum of its proper divisors (1).

2261689 is an equidigital number, since it uses as much as digits as its factorization.

2261689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 34.

The square root of 2261689 is about 1503.8912859645. The cubic root of 2261689 is about 131.2635952659.

The spelling of 2261689 in words is "two million, two hundred sixty-one thousand, six hundred eighty-nine".