1920020101 has 2 divisors, whose sum is σ = 1920020102. Its totient is φ = 1920020100.

The previous prime is 1920020099. The next prime is 1920020117. The reversal of 1920020101 is 1010200291.

It is an a-pointer prime, because the next prime (1920020117) can be obtained adding 1920020101 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1072628001 + 847392100 = 32751^2 + 29110^2 .

It is a cyclic number.

It is not a de Polignac number, because 1920020101 - 2¹ = 1920020099 is a prime.

Together with 1920020099, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1920020801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960010050 + 960010051.

It is an arithmetic number, because the mean of its divisors is an integer number (960010051).

Almost surely, 2^1920020101 is an apocalyptic number.

It is an amenable number.

1920020101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920020101 is an equidigital number, since it uses as much as digits as its factorization.

1920020101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 1920020101 is about 43818.0339700448. The cubic root of 1920020101 is about 1242.8973397609.

Adding to 1920020101 its reverse (1010200291), we get a palindrome (2930220392).

The spelling of 1920020101 in words is "one billion, nine hundred twenty million, twenty thousand, one hundred one".