1881109 has 2 divisors, whose sum is σ = 1881110. Its totient is φ = 1881108.

The previous prime is 1881083. The next prime is 1881119. The reversal of 1881109 is 9011881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1703025 + 178084 = 1305^2 + 422^2 .

It is an emirp because it is prime and its reverse (9011881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1881109 - 2⁹ = 1880597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1881119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940554 + 940555.

It is an arithmetic number, because the mean of its divisors is an integer number (940555).

2^1881109 is an apocalyptic number.

It is an amenable number.

1881109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881109 is an equidigital number, since it uses as much as digits as its factorization.

1881109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 28.

The square root of 1881109 is about 1371.5352711469. The cubic root of 1881109 is about 123.4443793314. Note that the first 3 decimals are identical.

The spelling of 1881109 in words is "one million, eight hundred eighty-one thousand, one hundred nine".