1981167 has 8 divisors (see below), whose sum is σ = 2661120. Its totient is φ = 1311000.

The previous prime is 1981159. The next prime is 1981169. The reversal of 1981167 is 7611891.

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

It is not a de Polignac number, because 1981167 - 2³ = 1981159 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1959 + ... + 2792.

It is an arithmetic number, because the mean of its divisors is an integer number (332640).

2^1981167 is an apocalyptic number.

1981167 is a deficient number, since it is larger than the sum of its proper divisors (679953).

1981167 is a wasteful number, since it uses less digits than its factorization.

1981167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4893.

The product of its digits is 3024, while the sum is 33.

The square root of 1981167 is about 1407.5393422565. The cubic root of 1981167 is about 125.5953889270.

The spelling of 1981167 in words is "one million, nine hundred eighty-one thousand, one hundred sixty-seven".