1981107 has 6 divisors (see below), whose sum is σ = 2861612. Its totient is φ = 1320732.

The previous prime is 1981099. The next prime is 1981141. The reversal of 1981107 is 7011891.

It is not a de Polignac number, because 1981107 - 2³ = 1981099 is a prime.

It is a Duffinian number.

1981107 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1981607) 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 5 ways as a sum of consecutive naturals, for example, 110053 + ... + 110070.

2^1981107 is an apocalyptic number.

1981107 is a deficient number, since it is larger than the sum of its proper divisors (880505).

1981107 is a wasteful number, since it uses less digits than its factorization.

1981107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220129 (or 220126 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 27.

The square root of 1981107 is about 1407.5180283037. The cubic root of 1981107 is about 125.5941210212.

Adding to 1981107 its reverse (7011891), we get a palindrome (8992998).

The spelling of 1981107 in words is "one million, nine hundred eighty-one thousand, one hundred seven".