1881061 has 12 divisors (see below), whose sum is σ = 2357292. Its totient is φ = 1487808.

The previous prime is 1881041. The next prime is 1881071. The reversal of 1881061 is 1601881.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 893025 + 988036 = 945^2 + 994^2 .

It is not a de Polignac number, because 1881061 - 2⁷ = 1880933 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881031) 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 in 11 ways as a sum of consecutive naturals, for example, 840 + ... + 2113.

It is an arithmetic number, because the mean of its divisors is an integer number (196441).

2^1881061 is an apocalyptic number.

It is an amenable number.

1881061 is a deficient number, since it is larger than the sum of its proper divisors (476231).

1881061 is a wasteful number, since it uses less digits than its factorization.

1881061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2980 (or 2973 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 1881061 is about 1371.5177723967. The cubic root of 1881061 is about 123.4433293514.

The spelling of 1881061 in words is "one million, eight hundred eighty-one thousand, sixty-one".