1661107 has 4 divisors (see below), whose sum is σ = 1898416. Its totient is φ = 1423800.

The previous prime is 1661069. The next prime is 1661111. The reversal of 1661107 is 7011661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1661107 - 2¹⁹ = 1136819 is a prime.

It is a Duffinian number.

1661107 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1661117) 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 3 ways as a sum of consecutive naturals, for example, 118644 + ... + 118657.

It is an arithmetic number, because the mean of its divisors is an integer number (474604).

2^1661107 is an apocalyptic number.

1661107 is a deficient number, since it is larger than the sum of its proper divisors (237309).

1661107 is an equidigital number, since it uses as much as digits as its factorization.

1661107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237308.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 1661107 is about 1288.8394003909. The cubic root of 1661107 is about 118.4311290122.

Adding to 1661107 its reverse (7011661), we get a palindrome (8672768).

The spelling of 1661107 in words is "one million, six hundred sixty-one thousand, one hundred seven".