1665131 has 8 divisors (see below), whose sum is σ = 1871520. Its totient is φ = 1469952.

The previous prime is 1665121. The next prime is 1665137. The reversal of 1665131 is 1315661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1665131 - 2⁶ = 1665067 is a prime.

It is a super-2 number, since 2×1665131² = 5545322494322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1665097 and 1665106.

It is not an unprimeable number, because it can be changed into a prime (1665137) 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 7 ways as a sum of consecutive naturals, for example, 2486 + ... + 3083.

It is an arithmetic number, because the mean of its divisors is an integer number (233940).

2^1665131 is an apocalyptic number.

1665131 is a deficient number, since it is larger than the sum of its proper divisors (206389).

1665131 is a wasteful number, since it uses less digits than its factorization.

1665131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5605.

The product of its digits is 540, while the sum is 23.

The square root of 1665131 is about 1290.3995505269. The cubic root of 1665131 is about 118.5266842765.

The spelling of 1665131 in words is "one million, six hundred sixty-five thousand, one hundred thirty-one".