1966111 has 8 divisors (see below), whose sum is σ = 2262560. Its totient is φ = 1673568.

The previous prime is 1966079. The next prime is 1966123. The reversal of 1966111 is 1116691.

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

It is a cyclic number.

It is not a de Polignac number, because 1966111 - 2⁵ = 1966079 is a prime.

It is a Duffinian number.

1966111 is a lucky number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966511) 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, 205 + ... + 1993.

It is an arithmetic number, because the mean of its divisors is an integer number (282820).

2^1966111 is an apocalyptic number.

1966111 is a deficient number, since it is larger than the sum of its proper divisors (296449).

1966111 is a wasteful number, since it uses less digits than its factorization.

1966111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1953.

The product of its digits is 324, while the sum is 25.

The square root of 1966111 is about 1402.1808014661. The cubic root of 1966111 is about 125.2764229389.

The spelling of 1966111 in words is "one million, nine hundred sixty-six thousand, one hundred eleven".