5661509049 has 27 divisors (see below), whose sum is σ = 9515531493. Its totient is φ = 3234245112.

The previous prime is 5661509047. The next prime is 5661509053. The reversal of 5661509049 is 9409051665.

It is a happy number.

The square root of 5661509049 is 75243.

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

It is not a de Polignac number, because 5661509049 - 2¹ = 5661509047 is a prime.

It is a super-3 number, since 3×5661509049³ (a number of 30 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 5661508995 and 5661509013.

It is not an unprimeable number, because it can be changed into a prime (5661509047) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1578312 + ... + 1581894.

Almost surely, 2^5661509049 is an apocalyptic number.

5661509049 is the 75243-rd square number.

5661509049 is the 37622-nd centered octagonal number.

It is an amenable number.

5661509049 is a deficient number, since it is larger than the sum of its proper divisors (3854022444).

5661509049 is an frugal number, since it uses more digits than its factorization.

5661509049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7186 (or 3593 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The cubic root of 5661509049 is about 1782.2860256152.

The spelling of 5661509049 in words is "five billion, six hundred sixty-one million, five hundred nine thousand, forty-nine".