1966511 has 2 divisors, whose sum is σ = 1966512. Its totient is φ = 1966510.

The previous prime is 1966507. The next prime is 1966561. The reversal of 1966511 is 1156691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1966511 - 2² = 1966507 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1966561) 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, 983255 + 983256.

It is an arithmetic number, because the mean of its divisors is an integer number (983256).

2^1966511 is an apocalyptic number.

1966511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1966511 is an equidigital number, since it uses as much as digits as its factorization.

1966511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 29.

The square root of 1966511 is about 1402.3234291703. The cubic root of 1966511 is about 125.2849180801.

The spelling of 1966511 in words is "one million, nine hundred sixty-six thousand, five hundred eleven".