3861511109 has 2 divisors, whose sum is σ = 3861511110. Its totient is φ = 3861511108.

The previous prime is 3861511061. The next prime is 3861511111. The reversal of 3861511109 is 9011151683.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3797270884 + 64240225 = 61622^2 + 8015^2 .

It is a cyclic number.

It is not a de Polignac number, because 3861511109 - 2⁸ = 3861510853 is a prime.

It is a super-2 number, since 2×3861511109² = 29822536089860819762, which contains 22 as substring.

Together with 3861511111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3861511309) 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, 1930755554 + 1930755555.

It is an arithmetic number, because the mean of its divisors is an integer number (1930755555).

Almost surely, 2^3861511109 is an apocalyptic number.

It is an amenable number.

3861511109 is a deficient number, since it is larger than the sum of its proper divisors (1).

3861511109 is an equidigital number, since it uses as much as digits as its factorization.

3861511109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 3861511109 is about 62141.0581580327. The cubic root of 3861511109 is about 1568.8656808521.

The spelling of 3861511109 in words is "three billion, eight hundred sixty-one million, five hundred eleven thousand, one hundred nine".