1665941 has 2 divisors, whose sum is σ = 1665942. Its totient is φ = 1665940.

The previous prime is 1665931. The next prime is 1665943. The reversal of 1665941 is 1495661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1110916 + 555025 = 1054^2 + 745^2 .

It is a cyclic number.

It is not a de Polignac number, because 1665941 - 2⁶ = 1665877 is a prime.

Together with 1665943, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1665898 and 1665907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1665943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832970 + 832971.

It is an arithmetic number, because the mean of its divisors is an integer number (832971).

2^1665941 is an apocalyptic number.

It is an amenable number.

1665941 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665941 is an equidigital number, since it uses as much as digits as its factorization.

1665941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The square root of 1665941 is about 1290.7133686454. The cubic root of 1665941 is about 118.5459001923.

The spelling of 1665941 in words is "one million, six hundred sixty-five thousand, nine hundred forty-one".