8513445749 has 4 divisors (see below), whose sum is σ = 8514011436. Its totient is φ = 8512880064.

The previous prime is 8513445727. The next prime is 8513445781. The reversal of 8513445749 is 9475443158.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9475443158 = 2 ⋅4737721579.

It can be written as a sum of positive squares in 2 ways, for example, as 1050213649 + 7463232100 = 32407^2 + 86390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8513445749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8513445697 and 8513445706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8513445719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259634 + ... + 290579.

It is an arithmetic number, because the mean of its divisors is an integer number (2128502859).

Almost surely, 2^8513445749 is an apocalyptic number.

It is an amenable number.

8513445749 is a deficient number, since it is larger than the sum of its proper divisors (565687).

8513445749 is a wasteful number, since it uses less digits than its factorization.

8513445749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565686.

The product of its digits is 2419200, while the sum is 50.

The square root of 8513445749 is about 92268.3355707688. The cubic root of 8513445749 is about 2041.9030803228.

The spelling of 8513445749 in words is "eight billion, five hundred thirteen million, four hundred forty-five thousand, seven hundred forty-nine".