3651905761 has 27 divisors (see below), whose sum is σ = 4341152889. Its totient is φ = 3063126528.

The previous prime is 3651905749. The next prime is 3651905801. The reversal of 3651905761 is 1675091563.

It is a happy number.

The square root of 3651905761 is 60431.

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 509630625 + 3142275136 = 22575^2 + 56056^2 .

It is not a de Polignac number, because 3651905761 - 2⁹ = 3651905249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3651905731) 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, 37648465 + ... + 37648561.

Almost surely, 2^3651905761 is an apocalyptic number.

3651905761 is the 60431-st square number.

3651905761 is the 30216-th centered octagonal number.

It is an amenable number.

3651905761 is a deficient number, since it is larger than the sum of its proper divisors (689247128).

3651905761 is an frugal number, since it uses more digits than its factorization.

3651905761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386 (or 193 counting only the distinct ones).

The product of its (nonzero) digits is 170100, while the sum is 43.

The cubic root of 3651905761 is about 1539.9496471140.

The spelling of 3651905761 in words is "three billion, six hundred fifty-one million, nine hundred five thousand, seven hundred sixty-one".