1881811 has 2 divisors, whose sum is σ = 1881812. Its totient is φ = 1881810.

The previous prime is 1881799. The next prime is 1881821. The reversal of 1881811 is 1181881.

It is a strong prime.

It is an emirp because it is prime and its reverse (1181881) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1881811 is a prime.

It is a Chen prime.

1881811 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1881811.

It is not a weakly prime, because it can be changed into another prime (1881821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940905 + 940906.

It is an arithmetic number, because the mean of its divisors is an integer number (940906).

2^1881811 is an apocalyptic number.

1881811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881811 is an equidigital number, since it uses as much as digits as its factorization.

1881811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 512, while the sum is 28.

The square root of 1881811 is about 1371.7911648644. The cubic root of 1881811 is about 123.4597332488.

The spelling of 1881811 in words is "one million, eight hundred eighty-one thousand, eight hundred eleven".