3875681221 has 2 divisors, whose sum is σ = 3875681222. Its totient is φ = 3875681220.

The previous prime is 3875681207. The next prime is 3875681363. The reversal of 3875681221 is 1221865783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3873693121 + 1988100 = 62239^2 + 1410^2 .

It is an emirp because it is prime and its reverse (1221865783) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3875681221 - 2²³ = 3867292613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3875682221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1937840610 + 1937840611.

It is an arithmetic number, because the mean of its divisors is an integer number (1937840611).

Almost surely, 2^3875681221 is an apocalyptic number.

It is an amenable number.

3875681221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3875681221 is an equidigital number, since it uses as much as digits as its factorization.

3875681221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 43.

The square root of 3875681221 is about 62254.9694482296. The cubic root of 3875681221 is about 1570.7823627153.

The spelling of 3875681221 in words is "three billion, eight hundred seventy-five million, six hundred eighty-one thousand, two hundred twenty-one".