1661073 has 16 divisors (see below), whose sum is σ = 2336256. Its totient is φ = 1048320.

The previous prime is 1661069. The next prime is 1661111. The reversal of 1661073 is 3701661.

It is not a de Polignac number, because 1661073 - 2² = 1661069 is a prime.

It is a super-2 number, since 2×1661073² = 5518327022658, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1661003) 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, 4761 + ... + 5097.

It is an arithmetic number, because the mean of its divisors is an integer number (146016).

2^1661073 is an apocalyptic number.

It is an amenable number.

1661073 is a deficient number, since it is larger than the sum of its proper divisors (675183).

1661073 is a wasteful number, since it uses less digits than its factorization.

1661073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 1661073 is about 1288.8262101618. The cubic root of 1661073 is about 118.4303209796.

The spelling of 1661073 in words is "one million, six hundred sixty-one thousand, seventy-three".