1881111 has 16 divisors (see below), whose sum is σ = 2626560. Its totient is φ = 1196160.

The previous prime is 1881109. The next prime is 1881119. The reversal of 1881111 is 1111881.

It is a happy number.

It is not a de Polignac number, because 1881111 - 2¹ = 1881109 is a prime.

1881111 is a modest number, since divided by 1111 gives 188 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881119) 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 in 15 ways as a sum of consecutive naturals, for example, 10420 + ... + 10598.

It is an arithmetic number, because the mean of its divisors is an integer number (164160).

2^1881111 is an apocalyptic number.

1881111 is a deficient number, since it is larger than the sum of its proper divisors (745449).

1881111 is a wasteful number, since it uses less digits than its factorization.

1881111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326.

The product of its digits is 64, while the sum is 21.

The square root of 1881111 is about 1371.5360002566. The cubic root of 1881111 is about 123.4444230802. Note that the first 4 decimals are identical.

Adding to 1881111 its reverse (1111881), we get a palindrome (2992992).

The spelling of 1881111 in words is "one million, eight hundred eighty-one thousand, one hundred eleven".