12261319989 has 32 divisors (see below), whose sum is σ = 18267626880. Its totient is φ = 7269875712.

The previous prime is 12261319963. The next prime is 12261320009. The reversal of 12261319989 is 98991316221.

It is not a de Polignac number, because 12261319989 - 2⁵ = 12261319957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12261319949) 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 31 ways as a sum of consecutive naturals, for example, 368757 + ... + 400629.

It is an arithmetic number, because the mean of its divisors is an integer number (570863340).

Almost surely, 2^12261319989 is an apocalyptic number.

12261319989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12261319989 is a deficient number, since it is larger than the sum of its proper divisors (6006306891).

12261319989 is a wasteful number, since it uses less digits than its factorization.

12261319989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32309.

The product of its digits is 419904, while the sum is 51.

The spelling of 12261319989 in words is "twelve billion, two hundred sixty-one million, three hundred nineteen thousand, nine hundred eighty-nine".