3856220561 has 2 divisors, whose sum is σ = 3856220562. Its totient is φ = 3856220560.

The previous prime is 3856220527. The next prime is 3856220573. The reversal of 3856220561 is 1650226583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3570779536 + 285441025 = 59756^2 + 16895^2 .

It is a cyclic number.

It is not a de Polignac number, because 3856220561 - 2²² = 3852026257 is a prime.

It is not a weakly prime, because it can be changed into another prime (3856220261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1928110280 + 1928110281.

It is an arithmetic number, because the mean of its divisors is an integer number (1928110281).

Almost surely, 2^3856220561 is an apocalyptic number.

It is an amenable number.

3856220561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3856220561 is an equidigital number, since it uses as much as digits as its factorization.

3856220561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 3856220561 is about 62098.4747075160. The cubic root of 3856220561 is about 1568.1488671101.

The spelling of 3856220561 in words is "three billion, eight hundred fifty-six million, two hundred twenty thousand, five hundred sixty-one".