1920101 has 2 divisors, whose sum is σ = 1920102. Its totient is φ = 1920100.

The previous prime is 1920089. The next prime is 1920143. The reversal of 1920101 is 1010291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1623076 + 297025 = 1274^2 + 545^2 .

It is an emirp because it is prime and its reverse (1010291) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1920101 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1920161) 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, 960050 + 960051.

It is an arithmetic number, because the mean of its divisors is an integer number (960051).

2^1920101 is an apocalyptic number.

It is an amenable number.

1920101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920101 is an equidigital number, since it uses as much as digits as its factorization.

1920101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1920101 is about 1385.6770908116. The cubic root of 1920101 is about 124.2914795783.

Adding to 1920101 its reverse (1010291), we get a palindrome (2930392).

The spelling of 1920101 in words is "one million, nine hundred twenty thousand, one hundred one".