19102009 has 2 divisors, whose sum is σ = 19102010. Its totient is φ = 19102008.

The previous prime is 19102007. The next prime is 19102021. The reversal of 19102009 is 90020191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17197609 + 1904400 = 4147^2 + 1380^2 .

It is a cyclic number.

It is not a de Polignac number, because 19102009 - 2¹ = 19102007 is a prime.

Together with 19102007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19102001) 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, 9551004 + 9551005.

It is an arithmetic number, because the mean of its divisors is an integer number (9551005).

Almost surely, 2^19102009 is an apocalyptic number.

It is an amenable number.

19102009 is a deficient number, since it is larger than the sum of its proper divisors (1).

19102009 is an equidigital number, since it uses as much as digits as its factorization.

19102009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 19102009 is about 4370.5845146845. The cubic root of 19102009 is about 267.3168583672.

The spelling of 19102009 in words is "nineteen million, one hundred two thousand, nine".