1981175 has 12 divisors (see below), whose sum is σ = 2807856. Its totient is φ = 1358400.

The previous prime is 1981169. The next prime is 1981181. The reversal of 1981175 is 5711891.

It is an interprime number because it is at equal distance from previous prime (1981169) and next prime (1981181).

It is not a de Polignac number, because 1981175 - 2⁴ = 1981159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5486 + ... + 5835.

It is an arithmetic number, because the mean of its divisors is an integer number (233988).

2^1981175 is an apocalyptic number.

1981175 is a deficient number, since it is larger than the sum of its proper divisors (826681).

1981175 is a wasteful number, since it uses less digits than its factorization.

1981175 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11338 (or 11333 counting only the distinct ones).

The product of its digits is 2520, while the sum is 32.

The square root of 1981175 is about 1407.5421840925. The cubic root of 1981175 is about 125.5955579791.

The spelling of 1981175 in words is "one million, nine hundred eighty-one thousand, one hundred seventy-five".