1209391191912 has 32 divisors (see below), whose sum is σ = 3027970558080. Its totient is φ = 402531386880.

The previous prime is 1209391191839. The next prime is 1209391191913. The reversal of 1209391191912 is 2191911939021.

It is not an unprimeable number, because it can be changed into a prime (1209391191913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37421664 + ... + 37453967.

It is an arithmetic number, because the mean of its divisors is an integer number (94624079940).

Almost surely, 2^{1209391191912} is an apocalyptic number.

1209391191912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1209391191912 is an abundant number, since it is smaller than the sum of its proper divisors (1818579366168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1209391191912 is a wasteful number, since it uses less digits than its factorization.

1209391191912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74876313 (or 74876309 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 48.

The spelling of 1209391191912 in words is "one trillion, two hundred nine billion, three hundred ninety-one million, one hundred ninety-one thousand, nine hundred twelve".