1909219601 has 2 divisors, whose sum is σ = 1909219602. Its totient is φ = 1909219600.

The previous prime is 1909219591. The next prime is 1909219603. The reversal of 1909219601 is 1069129091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1040385025 + 868834576 = 32255^2 + 29476^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1909219601 is a prime.

Together with 1909219603, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1909219603) 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, 954609800 + 954609801.

It is an arithmetic number, because the mean of its divisors is an integer number (954609801).

Almost surely, 2^1909219601 is an apocalyptic number.

It is an amenable number.

1909219601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1909219601 is an equidigital number, since it uses as much as digits as its factorization.

1909219601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 38.

The square root of 1909219601 is about 43694.6175289360. The cubic root of 1909219601 is about 1240.5624401754.

The spelling of 1909219601 in words is "one billion, nine hundred nine million, two hundred nineteen thousand, six hundred one".