7561519849 has 9 divisors (see below), whose sum is σ = 8189142213. Its totient is φ = 6978820992.

The previous prime is 7561519831. The next prime is 7561519853. The reversal of 7561519849 is 9489151657.

It is a happy number.

The square root of 7561519849 is 86957.

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

It can be written as a sum of positive squares in 4 ways, for example, as 4347225 + 7557172624 = 2085^2 + 86932^2 .

It is not a de Polignac number, because 7561519849 - 2¹¹ = 7561517801 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7561519849.

It is not an unprimeable number, because it can be changed into a prime (7561519829) 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, 1127097 + ... + 1133785.

Almost surely, 2^7561519849 is an apocalyptic number.

7561519849 is the 86957-th square number.

7561519849 is the 43479-th centered octagonal number.

It is an amenable number.

7561519849 is a deficient number, since it is larger than the sum of its proper divisors (627622364).

7561519849 is an frugal number, since it uses more digits than its factorization.

7561519849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13404 (or 6702 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 55.

The cubic root of 7561519849 is about 1962.7712991751.

The spelling of 7561519849 in words is "seven billion, five hundred sixty-one million, five hundred nineteen thousand, eight hundred forty-nine".