3869847500861 has 2 divisors, whose sum is σ = 3869847500862. Its totient is φ = 3869847500860.

The previous prime is 3869847500821. The next prime is 3869847500951. The reversal of 3869847500861 is 1680057489683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3692527344025 + 177320156836 = 1921595^2 + 421094^2 .

It is a cyclic number.

It is not a de Polignac number, because 3869847500861 - 2³⁴ = 3852667631677 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3869847500821) 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, 1934923750430 + 1934923750431.

It is an arithmetic number, because the mean of its divisors is an integer number (1934923750431).

Almost surely, 2^{3869847500861} is an apocalyptic number.

It is an amenable number.

3869847500861 is a deficient number, since it is larger than the sum of its proper divisors (1).

3869847500861 is an equidigital number, since it uses as much as digits as its factorization.

3869847500861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69672960, while the sum is 65.

The spelling of 3869847500861 in words is "three trillion, eight hundred sixty-nine billion, eight hundred forty-seven million, five hundred thousand, eight hundred sixty-one".