12191381985 has 16 divisors (see below), whose sum is σ = 19515390336. Its totient is φ = 6499010688.

The previous prime is 12191381971. The next prime is 12191381999. The reversal of 12191381985 is 58918319121.

It is an interprime number because it is at equal distance from previous prime (12191381971) and next prime (12191381999).

It is not a de Polignac number, because 12191381985 - 2⁵ = 12191381953 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 158109 + ... + 222218.

It is an arithmetic number, because the mean of its divisors is an integer number (1219711896).

Almost surely, 2^12191381985 is an apocalyptic number.

12191381985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12191381985 is a deficient number, since it is larger than the sum of its proper divisors (7324008351).

12191381985 is a wasteful number, since it uses less digits than its factorization.

12191381985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382472.

The product of its digits is 155520, while the sum is 48.

The spelling of 12191381985 in words is "twelve billion, one hundred ninety-one million, three hundred eighty-one thousand, nine hundred eighty-five".