3571561 has 6 divisors (see below), whose sum is σ = 4154730. Its totient is φ = 3061296.

The previous prime is 3571559. The next prime is 3571583. The reversal of 3571561 is 1651753.

It can be written as a sum of positive squares in only one way, i.e., 3493161 + 78400 = 1869^2 + 280^2 .

It is not a de Polignac number, because 3571561 - 2¹ = 3571559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3571501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36396 + ... + 36493.

It is an arithmetic number, because the mean of its divisors is an integer number (692455).

Almost surely, 2^3571561 is an apocalyptic number.

It is an amenable number.

3571561 is a deficient number, since it is larger than the sum of its proper divisors (583169).

3571561 is an equidigital number, since it uses as much as digits as its factorization.

3571561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72903 (or 72896 counting only the distinct ones).

The product of its digits is 3150, while the sum is 28.

The square root of 3571561 is about 1889.8574020280. The cubic root of 3571561 is about 152.8572436353.

The spelling of 3571561 in words is "three million, five hundred seventy-one thousand, five hundred sixty-one".