1919211849 has 6 divisors (see below), whose sum is σ = 2772194906. Its totient is φ = 1279474560.

The previous prime is 1919211809. The next prime is 1919211857. The reversal of 1919211849 is 9481129191.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1907942400 + 11269449 = 43680^2 + 3357^2 .

It is not a de Polignac number, because 1919211849 - 2¹¹ = 1919209801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1919211809) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106622872 + ... + 106622889.

Almost surely, 2^1919211849 is an apocalyptic number.

It is an amenable number.

1919211849 is a deficient number, since it is larger than the sum of its proper divisors (852983057).

1919211849 is a wasteful number, since it uses less digits than its factorization.

1919211849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213245767 (or 213245764 counting only the distinct ones).

The product of its digits is 46656, while the sum is 45.

The square root of 1919211849 is about 43808.8101755800. The cubic root of 1919211849 is about 1242.7229118552.

The spelling of 1919211849 in words is "one billion, nine hundred nineteen million, two hundred eleven thousand, eight hundred forty-nine".