1109861 has 2 divisors, whose sum is σ = 1109862. Its totient is φ = 1109860.

The previous prime is 1109851. The next prime is 1109869. The reversal of 1109861 is 1689011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 592900 + 516961 = 770^2 + 719^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1109861 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1109861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1109869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554930 + 554931.

It is an arithmetic number, because the mean of its divisors is an integer number (554931).

2^1109861 is an apocalyptic number.

It is an amenable number.

1109861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109861 is an equidigital number, since it uses as much as digits as its factorization.

1109861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 1109861 is about 1053.4994067393. The cubic root of 1109861 is about 103.5355584295.

The spelling of 1109861 in words is "one million, one hundred nine thousand, eight hundred sixty-one".