4149807561 has 27 divisors (see below), whose sum is σ = 6080528181. Its totient is φ = 2727242784.

The previous prime is 4149807551. The next prime is 4149807581. The reversal of 4149807561 is 1657089414.

The square root of 4149807561 is 64419.

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

4149807561 is a `hidden beast` number, since 4 + 1 + 4 + 9 + 80 + 7 + 561 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2322758025 + 1827049536 = 48195^2 + 42744^2 .

It is not a de Polignac number, because 4149807561 - 2¹³ = 4149799369 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4149807521) 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 26 ways as a sum of consecutive naturals, for example, 21064915 + ... + 21065111.

Almost surely, 2^4149807561 is an apocalyptic number.

4149807561 is the 64419-th square number.

4149807561 is the 32210-th centered octagonal number.

It is an amenable number.

4149807561 is a deficient number, since it is larger than the sum of its proper divisors (1930720620).

4149807561 is an equidigital number, since it uses as much as digits as its factorization.

4149807561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618 (or 309 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The cubic root of 4149807561 is about 1606.9757355856.

The spelling of 4149807561 in words is "four billion, one hundred forty-nine million, eight hundred seven thousand, five hundred sixty-one".