1966161 has 4 divisors (see below), whose sum is σ = 2621552. Its totient is φ = 1310772.

The previous prime is 1966127. The next prime is 1966163. The reversal of 1966161 is 1616691.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1966161 - 2¹¹ = 1964113 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1966163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327691 + ... + 327696.

It is an arithmetic number, because the mean of its divisors is an integer number (655388).

2^1966161 is an apocalyptic number.

It is an amenable number.

1966161 is a deficient number, since it is larger than the sum of its proper divisors (655391).

1966161 is an equidigital number, since it uses as much as digits as its factorization.

1966161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655390.

The product of its digits is 1944, while the sum is 30.

The square root of 1966161 is about 1402.1986307225. The cubic root of 1966161 is about 125.2774848946.

The spelling of 1966161 in words is "one million, nine hundred sixty-six thousand, one hundred sixty-one".