12901097889 has 9 divisors (see below), whose sum is σ = 18635411379. Its totient is φ = 8600504760.

The previous prime is 12901097863. The next prime is 12901097903. The reversal of 12901097889 is 98879010921.

The square root of 12901097889 is 113583.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 12596246289 + 304851600 = 112233^2 + 17460^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 12901097889 - 2¹¹ = 12901095841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12901097089) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 321819 + ... + 359679.

Almost surely, 2^12901097889 is an apocalyptic number.

12901097889 is the 113583-rd square number.

12901097889 is the 56792-nd centered octagonal number.

It is an amenable number.

12901097889 is a deficient number, since it is larger than the sum of its proper divisors (5734313490).

12901097889 is an frugal number, since it uses more digits than its factorization.

12901097889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75728 (or 37864 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 54.

The spelling of 12901097889 in words is "twelve billion, nine hundred one million, ninety-seven thousand, eight hundred eighty-nine".