1601166 has 32 divisors (see below), whose sum is σ = 3720960. Its totient is φ = 449856.

The previous prime is 1601161. The next prime is 1601203. The reversal of 1601166 is 6611061.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2530 + ... + 3098.

It is an arithmetic number, because the mean of its divisors is an integer number (116280).

2^1601166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1601166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1860480).

1601166 is an abundant number, since it is smaller than the sum of its proper divisors (2119794).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1601166 is a wasteful number, since it uses less digits than its factorization.

1601166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1601166 is about 1265.3718820963. The cubic root of 1601166 is about 116.9891143353.

It can be divided in two parts, 160 and 1166, that added together give a triangular number (1326 = T₅₁).

The spelling of 1601166 in words is "one million, six hundred one thousand, one hundred sixty-six".