3865515139 has 2 divisors, whose sum is σ = 3865515140. Its totient is φ = 3865515138.

The previous prime is 3865515107. The next prime is 3865515149. The reversal of 3865515139 is 9315155683.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3865515139 - 2⁵ = 3865515107 is a prime.

It is not a weakly prime, because it can be changed into another prime (3865515149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1932757569 + 1932757570.

It is an arithmetic number, because the mean of its divisors is an integer number (1932757570).

Almost surely, 2^3865515139 is an apocalyptic number.

3865515139 is a deficient number, since it is larger than the sum of its proper divisors (1).

3865515139 is an equidigital number, since it uses as much as digits as its factorization.

3865515139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486000, while the sum is 46.

The square root of 3865515139 is about 62173.2670767750. The cubic root of 3865515139 is about 1569.4077497568.

The spelling of 3865515139 in words is "three billion, eight hundred sixty-five million, five hundred fifteen thousand, one hundred thirty-nine".