3709561 has 2 divisors, whose sum is σ = 3709562. Its totient is φ = 3709560.

The previous prime is 3709513. The next prime is 3709577. The reversal of 3709561 is 1659073.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2499561 + 1210000 = 1581^2 + 1100^2 .

It is a cyclic number.

It is not a de Polignac number, because 3709561 - 2¹⁵ = 3676793 is a prime.

It is not a weakly prime, because it can be changed into another prime (3709501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1854780 + 1854781.

It is an arithmetic number, because the mean of its divisors is an integer number (1854781).

Almost surely, 2^3709561 is an apocalyptic number.

It is an amenable number.

3709561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3709561 is an equidigital number, since it uses as much as digits as its factorization.

3709561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 3709561 is about 1926.0220663326. The cubic root of 3709561 is about 154.8011463124.

The spelling of 3709561 in words is "three million, seven hundred nine thousand, five hundred sixty-one".