1969812009 has 24 divisors (see below), whose sum is σ = 3115442304. Its totient is φ = 1189404000.

The previous prime is 1969811999. The next prime is 1969812011. The reversal of 1969812009 is 9002189691.

It is not a de Polignac number, because 1969812009 - 2¹⁹ = 1969287721 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1969812029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9882 + ... + 63539.

It is an arithmetic number, because the mean of its divisors is an integer number (129810096).

Almost surely, 2^1969812009 is an apocalyptic number.

It is an amenable number.

1969812009 is a deficient number, since it is larger than the sum of its proper divisors (1145630295).

1969812009 is a wasteful number, since it uses less digits than its factorization.

1969812009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73709 (or 73706 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 45.

The square root of 1969812009 is about 44382.5642454331. The cubic root of 1969812009 is about 1253.5498048192.

The spelling of 1969812009 in words is "one billion, nine hundred sixty-nine million, eight hundred twelve thousand, nine".