1991200012 has 6 divisors (see below), whose sum is σ = 3484600028. Its totient is φ = 995600004.

The previous prime is 1991200009. The next prime is 1991200031. The reversal of 1991200012 is 2100021991.

It is a self number, because there is not a number n which added to its sum of digits gives 1991200012.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 248899998 + ... + 248900005.

Almost surely, 2^1991200012 is an apocalyptic number.

It is an amenable number.

1991200012 is a deficient number, since it is larger than the sum of its proper divisors (1493400016).

1991200012 is a wasteful number, since it uses less digits than its factorization.

1991200012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497800007 (or 497800005 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 1991200012 is about 44622.8642290026. The cubic root of 1991200012 is about 1258.0704513409.

The spelling of 1991200012 in words is "one billion, nine hundred ninety-one million, two hundred thousand, twelve".