1669161 has 16 divisors (see below), whose sum is σ = 2422784. Its totient is φ = 1016064.

The previous prime is 1669147. The next prime is 1669163. The reversal of 1669161 is 1619661.

It is a happy number.

It is not a de Polignac number, because 1669161 - 2⁶ = 1669097 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1669163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4785 + ... + 5121.

It is an arithmetic number, because the mean of its divisors is an integer number (151424).

2^1669161 is an apocalyptic number.

It is an amenable number.

1669161 is a deficient number, since it is larger than the sum of its proper divisors (753623).

1669161 is a wasteful number, since it uses less digits than its factorization.

1669161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480.

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

The square root of 1669161 is about 1291.9601387040. The cubic root of 1669161 is about 118.6222278512.

It can be divided in two parts, 1669 and 161, that added together give a triangular number (1830 = T₆₀).

The spelling of 1669161 in words is "one million, six hundred sixty-nine thousand, one hundred sixty-one".