1919213009 has 16 divisors (see below), whose sum is σ = 2331703680. Its totient is φ = 1543017600.

The previous prime is 1919213003. The next prime is 1919213027. The reversal of 1919213009 is 9003129191.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1919213009 is a prime.

It is a Duffinian number.

1919213009 is a modest number, since divided by 213009 gives 1919 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 1919213009.

It is not an unprimeable number, because it can be changed into a prime (1919213003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58004 + ... + 84869.

It is an arithmetic number, because the mean of its divisors is an integer number (145731480).

Almost surely, 2^1919213009 is an apocalyptic number.

1919213009 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1919213009 is a deficient number, since it is larger than the sum of its proper divisors (412490671).

1919213009 is a wasteful number, since it uses less digits than its factorization.

1919213009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143000.

The product of its (nonzero) digits is 4374, while the sum is 35.

The square root of 1919213009 is about 43808.8234149241. The cubic root of 1919213009 is about 1242.7231622285.

The spelling of 1919213009 in words is "one billion, nine hundred nineteen million, two hundred thirteen thousand, nine".