666031 has 2 divisors, whose sum is σ = 666032. Its totient is φ = 666030.

The previous prime is 666023. The next prime is 666041. The reversal of 666031 is 130666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666031 - 2³ = 666023 is a prime.

It is a super-2 number, since 2×666031² = 887194585922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 665993 and 666011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666041) 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 as a sum of consecutive naturals, namely, 333015 + 333016.

It is an arithmetic number, because the mean of its divisors is an integer number (333016).

2⁶⁶⁶⁰³¹ is an apocalyptic number.

666031 is a deficient number, since it is larger than the sum of its proper divisors (1).

666031 is an equidigital number, since it uses as much as digits as its factorization.

666031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 666031 is about 816.1072233475. The cubic root of 666031 is about 87.3302723451.

Adding to 666031 its reverse (130666), we get a palindrome (796697).

The spelling of 666031 in words is "six hundred sixty-six thousand, thirty-one".