12497227681 has 3 divisors (see below), whose sum is σ = 12497339473. Its totient is φ = 12497115890.

The previous prime is 12497227679. The next prime is 12497227693. The reversal of 12497227681 is 18672279421.

The square root of 12497227681 is 111791.

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

12497227681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18672279421 = 71 ⋅262989851.

It is not a de Polignac number, because 12497227681 - 2¹ = 12497227679 is a prime.

It is a super-2 number, since 2×12497227681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12497222681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 55896 + ... + 167686.

Almost surely, 2^12497227681 is an apocalyptic number.

12497227681 is the 111791-st square number.

12497227681 is the 55896-th centered octagonal number.

It is an amenable number.

12497227681 is a deficient number, since it is larger than the sum of its proper divisors (111792).

12497227681 is an frugal number, since it uses more digits than its factorization.

12497227681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223582 (or 111791 counting only the distinct ones).

The product of its digits is 677376, while the sum is 49.

Multiplying 12497227681 by its sum of digits (49), we get a square (612364156369 = 782537²).

The spelling of 12497227681 in words is "twelve billion, four hundred ninety-seven million, two hundred twenty-seven thousand, six hundred eighty-one".