1919985512 has 8 divisors (see below), whose sum is σ = 3599972850. Its totient is φ = 959992752.

The previous prime is 1919985503. The next prime is 1919985517. The reversal of 1919985512 is 2155899191.

It can be written as a sum of positive squares in only one way, i.e., 1281210436 + 638775076 = 35794^2 + 25274^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1919985517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119999087 + ... + 119999102.

Almost surely, 2^1919985512 is an apocalyptic number.

It is an amenable number.

1919985512 is a deficient number, since it is larger than the sum of its proper divisors (1679987338).

1919985512 is a wasteful number, since it uses less digits than its factorization.

1919985512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239998195 (or 239998191 counting only the distinct ones).

The product of its digits is 291600, while the sum is 50.

The square root of 1919985512 is about 43817.6392791761. The cubic root of 1919985512 is about 1242.8898761525.

The spelling of 1919985512 in words is "one billion, nine hundred nineteen million, nine hundred eighty-five thousand, five hundred twelve".