3875867861 has 2 divisors, whose sum is σ = 3875867862. Its totient is φ = 3875867860.

The previous prime is 3875867843. The next prime is 3875867867. The reversal of 3875867861 is 1687685783.

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., 2905856836 + 970011025 = 53906^2 + 31145^2 .

It is a cyclic number.

It is not a de Polignac number, because 3875867861 - 2⁶ = 3875867797 is a prime.

It is a super-3 number, since 3×3875867861³ (a number of 30 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3875867861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3875867867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1937933930 + 1937933931.

It is an arithmetic number, because the mean of its divisors is an integer number (1937933931).

Almost surely, 2^3875867861 is an apocalyptic number.

It is an amenable number.

3875867861 is a deficient number, since it is larger than the sum of its proper divisors (1).

3875867861 is an equidigital number, since it uses as much as digits as its factorization.

3875867861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13547520, while the sum is 59.

The square root of 3875867861 is about 62256.4684269836. The cubic root of 3875867861 is about 1570.8075768731.

The spelling of 3875867861 in words is "three billion, eight hundred seventy-five million, eight hundred sixty-seven thousand, eight hundred sixty-one".