1981106 has 8 divisors (see below), whose sum is σ = 3074220. Its totient is φ = 956368.

The previous prime is 1981099. The next prime is 1981141. The reversal of 1981106 is 6011891.

It can be written as a sum of positive squares in 2 ways, for example, as 1934881 + 46225 = 1391^2 + 215^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17021 + ... + 17136.

2^1981106 is an apocalyptic number.

1981106 is a deficient number, since it is larger than the sum of its proper divisors (1093114).

1981106 is a wasteful number, since it uses less digits than its factorization.

1981106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34188.

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

The square root of 1981106 is about 1407.5176730684. The cubic root of 1981106 is about 125.5940998892.

Adding to 1981106 its reverse (6011891), we get a palindrome (7992997).

The spelling of 1981106 in words is "one million, nine hundred eighty-one thousand, one hundred six".