4651649209 has 9 divisors (see below), whose sum is σ = 4687594479. Its totient is φ = 4615979040.

The previous prime is 4651649207. The next prime is 4651649221. The reversal of 4651649209 is 9029461564.

The square root of 4651649209 is 68203.

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

It can be written as a sum of positive squares in only one way, i.e., 3498367609 + 1153281600 = 59147^2 + 33960^2 .

It is not a de Polignac number, because 4651649209 - 2¹ = 4651649207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4651649207) 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, 16436782 + ... + 16437064.

It is an arithmetic number, because the mean of its divisors is an integer number (520843831).

Almost surely, 2^4651649209 is an apocalyptic number.

4651649209 is the 68203-rd square number.

4651649209 is the 34102-nd centered octagonal number.

It is an amenable number.

4651649209 is a deficient number, since it is larger than the sum of its proper divisors (35945270).

4651649209 is an frugal number, since it uses more digits than its factorization.

4651649209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048 (or 524 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 46.

The cubic root of 4651649209 is about 1669.3048380189.

The spelling of 4651649209 in words is "four billion, six hundred fifty-one million, six hundred forty-nine thousand, two hundred nine".