3937561 has 2 divisors, whose sum is σ = 3937562. Its totient is φ = 3937560.

The previous prime is 3937559. The next prime is 3937567. The reversal of 3937561 is 1657393.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3920400 + 17161 = 1980^2 + 131^2 .

It is a cyclic number.

It is not a de Polignac number, because 3937561 - 2¹ = 3937559 is a prime.

Together with 3937559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3937567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1968780 + 1968781.

It is an arithmetic number, because the mean of its divisors is an integer number (1968781).

Almost surely, 2^3937561 is an apocalyptic number.

It is an amenable number.

3937561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3937561 is an equidigital number, since it uses as much as digits as its factorization.

3937561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17010, while the sum is 34.

The square root of 3937561 is about 1984.3288537941. The cubic root of 3937561 is about 157.9098053826.

The spelling of 3937561 in words is "three million, nine hundred thirty-seven thousand, five hundred sixty-one".