3836209981 has 2 divisors, whose sum is σ = 3836209982. Its totient is φ = 3836209980.

The previous prime is 3836209969. The next prime is 3836209999. The reversal of 3836209981 is 1899026383.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3783357081 + 52852900 = 61509^2 + 7270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3836209981 is a prime.

It is a super-3 number, since 3×3836209981³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3836209961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1918104990 + 1918104991.

It is an arithmetic number, because the mean of its divisors is an integer number (1918104991).

Almost surely, 2^3836209981 is an apocalyptic number.

It is an amenable number.

3836209981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3836209981 is an equidigital number, since it uses as much as digits as its factorization.

3836209981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 3836209981 is about 61937.1454056449. The cubic root of 3836209981 is about 1565.4316985907.

The spelling of 3836209981 in words is "three billion, eight hundred thirty-six million, two hundred nine thousand, nine hundred eighty-one".