3857561 has 2 divisors, whose sum is σ = 3857562. Its totient is φ = 3857560.

The previous prime is 3857549. The next prime is 3857569. The reversal of 3857561 is 1657583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2371600 + 1485961 = 1540^2 + 1219^2 .

It is an emirp because it is prime and its reverse (1657583) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3857561 - 2¹⁰ = 3856537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3857569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1928780 + 1928781.

It is an arithmetic number, because the mean of its divisors is an integer number (1928781).

Almost surely, 2^3857561 is an apocalyptic number.

It is an amenable number.

3857561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3857561 is an equidigital number, since it uses as much as digits as its factorization.

3857561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 35.

The square root of 3857561 is about 1964.0674631998. The cubic root of 3857561 is about 156.8330544511.

The spelling of 3857561 in words is "three million, eight hundred fifty-seven thousand, five hundred sixty-one".