1909966061 has 2 divisors, whose sum is σ = 1909966062. Its totient is φ = 1909966060.

The previous prime is 1909966039. The next prime is 1909966063. The reversal of 1909966061 is 1606699091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1281210436 + 628755625 = 35794^2 + 25075^2 .

It is an emirp because it is prime and its reverse (1606699091) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1909966061 is a prime.

Together with 1909966063, it forms a pair of twin primes.

It is a Chen prime.

1909966061 is a strobogrammatic number because it is the same when read upside-down.

It is a junction number, because it is equal to n+sod(n) for n = 1909965997 and 1909966015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1909966063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 954983030 + 954983031.

It is an arithmetic number, because the mean of its divisors is an integer number (954983031).

Almost surely, 2^1909966061 is an apocalyptic number.

It is an amenable number.

1909966061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1909966061 is an equidigital number, since it uses as much as digits as its factorization.

1909966061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 157464, while the sum is 47.

The square root of 1909966061 is about 43703.1584785356. The cubic root of 1909966061 is about 1240.7240960302.

The spelling of 1909966061 in words is "one billion, nine hundred nine million, nine hundred sixty-six thousand, sixty-one".