3865123321 has 2 divisors, whose sum is σ = 3865123322. Its totient is φ = 3865123320.

The previous prime is 3865123313. The next prime is 3865123331. The reversal of 3865123321 is 1233215683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2098098025 + 1767025296 = 45805^2 + 42036^2 .

It is a cyclic number.

It is not a de Polignac number, because 3865123321 - 2³ = 3865123313 is a prime.

It is a super-3 number, since 3×3865123321³ (a number of 30 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (3865123331) 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 as a sum of consecutive naturals, namely, 1932561660 + 1932561661.

It is an arithmetic number, because the mean of its divisors is an integer number (1932561661).

Almost surely, 2^3865123321 is an apocalyptic number.

It is an amenable number.

3865123321 is a deficient number, since it is larger than the sum of its proper divisors (1).

3865123321 is an equidigital number, since it uses as much as digits as its factorization.

3865123321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 34.

The square root of 3865123321 is about 62170.1159802682. The cubic root of 3865123321 is about 1569.3547216384.

The spelling of 3865123321 in words is "three billion, eight hundred sixty-five million, one hundred twenty-three thousand, three hundred twenty-one".