11915250649 has 9 divisors (see below), whose sum is σ = 12659348541. Its totient is φ = 11212607040.

The previous prime is 11915250647. The next prime is 11915250653. The reversal of 11915250649 is 94605251911.

The square root of 11915250649 is 109157.

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

11915250649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 49070025 + 11866180624 = 7005^2 + 108932^2 .

It is not a de Polignac number, because 11915250649 - 2¹ = 11915250647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11915250643) 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 8 ways as a sum of consecutive naturals, for example, 1852459 + ... + 1858879.

Almost surely, 2^11915250649 is an apocalyptic number.

11915250649 is the 109157-th square number.

11915250649 is the 54579-th centered octagonal number.

It is an amenable number.

11915250649 is a deficient number, since it is larger than the sum of its proper divisors (744097892).

11915250649 is an frugal number, since it uses more digits than its factorization.

11915250649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12876 (or 6438 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 43.

The spelling of 11915250649 in words is "eleven billion, nine hundred fifteen million, two hundred fifty thousand, six hundred forty-nine".