12909899197 has 6 divisors (see below), whose sum is σ = 13903409562. Its totient is φ = 11916451872.

The previous prime is 12909899143. The next prime is 12909899203. The reversal of 12909899197 is 79199890921.

It can be written as a sum of positive squares in 3 ways, for example, as 3505942521 + 9403956676 = 59211^2 + 96974^2 .

It is not a de Polignac number, because 12909899197 - 2¹⁵ = 12909866429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12909890197) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 393913 + ... + 425425.

It is an arithmetic number, because the mean of its divisors is an integer number (2317234927).

Almost surely, 2^12909899197 is an apocalyptic number.

It is an amenable number.

12909899197 is a deficient number, since it is larger than the sum of its proper divisors (993510365).

12909899197 is an frugal number, since it uses more digits than its factorization.

12909899197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63039 (or 31526 counting only the distinct ones).

The product of its (nonzero) digits is 6613488, while the sum is 64.

The spelling of 12909899197 in words is "twelve billion, nine hundred nine million, eight hundred ninety-nine thousand, one hundred ninety-seven".