1969021 has 2 divisors, whose sum is σ = 1969022. Its totient is φ = 1969020.

The previous prime is 1969001. The next prime is 1969031. The reversal of 1969021 is 1209691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1625625 + 343396 = 1275^2 + 586^2 .

It is a cyclic number.

It is not a de Polignac number, because 1969021 - 2¹¹ = 1966973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1969001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984510 + 984511.

It is an arithmetic number, because the mean of its divisors is an integer number (984511).

2^1969021 is an apocalyptic number.

It is an amenable number.

1969021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1969021 is an equidigital number, since it uses as much as digits as its factorization.

1969021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 1969021 is about 1403.2180871126. The cubic root of 1969021 is about 125.3381988139.

The spelling of 1969021 in words is "one million, nine hundred sixty-nine thousand, twenty-one".