3841561 has 2 divisors, whose sum is σ = 3841562. Its totient is φ = 3841560.

The previous prime is 3841559. The next prime is 3841567. The reversal of 3841561 is 1651483.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3825936 + 15625 = 1956^2 + 125^2 .

It is a cyclic number.

It is not a de Polignac number, because 3841561 - 2¹ = 3841559 is a prime.

Together with 3841559, it forms a pair of twin primes.

3841561 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3841567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1920780 + 1920781.

It is an arithmetic number, because the mean of its divisors is an integer number (1920781).

Almost surely, 2^3841561 is an apocalyptic number.

It is an amenable number.

3841561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3841561 is an equidigital number, since it uses as much as digits as its factorization.

3841561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 28.

The square root of 3841561 is about 1959.9900509952. The cubic root of 3841561 is about 156.6159218985.

The spelling of 3841561 in words is "three million, eight hundred forty-one thousand, five hundred sixty-one".