3987545321 has 2 divisors, whose sum is σ = 3987545322. Its totient is φ = 3987545320.

The previous prime is 3987545311. The next prime is 3987545369. The reversal of 3987545321 is 1235457893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3943840000 + 43705321 = 62800^2 + 6611^2 .

It is a cyclic number.

It is not a de Polignac number, because 3987545321 - 2¹⁸ = 3987283177 is a prime.

It is a super-3 number, since 3×3987545321³ (a number of 30 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (3987545311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1993772660 + 1993772661.

It is an arithmetic number, because the mean of its divisors is an integer number (1993772661).

Almost surely, 2^3987545321 is an apocalyptic number.

It is an amenable number.

3987545321 is a deficient number, since it is larger than the sum of its proper divisors (1).

3987545321 is an equidigital number, since it uses as much as digits as its factorization.

3987545321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 907200, while the sum is 47.

The square root of 3987545321 is about 63147.0135556702. The cubic root of 3987545321 is about 1585.7517914856.

The spelling of 3987545321 in words is "three billion, nine hundred eighty-seven million, five hundred forty-five thousand, three hundred twenty-one".