12452997649 has 3 divisors (see below), whose sum is σ = 12453109243. Its totient is φ = 12452886056.

The previous prime is 12452997589. The next prime is 12452997653. The reversal of 12452997649 is 94679925421.

The square root of 12452997649 is 111593.

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

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: 94679925421 = 109 ⋅868623169.

It can be written as a sum of positive squares in only one way, i.e., 11849411025 + 603586624 = 108855^2 + 24568^2 .

It is not a de Polignac number, because 12452997649 - 2⁷ = 12452997521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12452997593 and 12452997602.

It is not an unprimeable number, because it can be changed into a prime (12452997049) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 55797 + ... + 167389.

Almost surely, 2^12452997649 is an apocalyptic number.

12452997649 is the 111593-rd square number.

12452997649 is the 55797-th centered octagonal number.

It is an amenable number.

12452997649 is a deficient number, since it is larger than the sum of its proper divisors (111594).

12452997649 is an frugal number, since it uses more digits than its factorization.

12452997649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223186 (or 111593 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 58.

It can be divided in two parts, 12452 and 997649, that added together give a palindrome (1010101).

The spelling of 12452997649 in words is "twelve billion, four hundred fifty-two million, nine hundred ninety-seven thousand, six hundred forty-nine".