3649247281 has 9 divisors (see below), whose sum is σ = 3680010369. Its totient is φ = 3618740736.

The previous prime is 3649247209. The next prime is 3649247311. The reversal of 3649247281 is 1827429463.

It is a happy number.

The square root of 3649247281 is 60409.

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 2504101681 + 1145145600 = 50041^2 + 33840^2 .

It is not a de Polignac number, because 3649247281 - 2¹¹ = 3649245233 is a prime.

It is a super-2 number, since 2×3649247281² = 26634011435771785922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3649217281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 11658781 + ... + 11659093.

It is an arithmetic number, because the mean of its divisors is an integer number (408890041).

Almost surely, 2^3649247281 is an apocalyptic number.

3649247281 is the 60409-th square number.

3649247281 is the 30205-th centered octagonal number.

It is an amenable number.

3649247281 is a deficient number, since it is larger than the sum of its proper divisors (30763088).

3649247281 is an frugal number, since it uses more digits than its factorization.

3649247281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012 (or 506 counting only the distinct ones).

The product of its digits is 580608, while the sum is 46.

The cubic root of 3649247281 is about 1539.5758770492.

The spelling of 3649247281 in words is "three billion, six hundred forty-nine million, two hundred forty-seven thousand, two hundred eighty-one".