1966813 has 2 divisors, whose sum is σ = 1966814. Its totient is φ = 1966812.

The previous prime is 1966807. The next prime is 1966817. The reversal of 1966813 is 3186691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1734489 + 232324 = 1317^2 + 482^2 .

It is an emirp because it is prime and its reverse (3186691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1966813 - 2⁹ = 1966301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1966817) 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, 983406 + 983407.

It is an arithmetic number, because the mean of its divisors is an integer number (983407).

2^1966813 is an apocalyptic number.

It is an amenable number.

1966813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1966813 is an equidigital number, since it uses as much as digits as its factorization.

1966813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 34.

The square root of 1966813 is about 1402.4311034771. The cubic root of 1966813 is about 125.2913311485.

The spelling of 1966813 in words is "one million, nine hundred sixty-six thousand, eight hundred thirteen".