3520661 has 4 divisors (see below), whose sum is σ = 3615852. Its totient is φ = 3425472.

The previous prime is 3520613. The next prime is 3520663. The reversal of 3520661 is 1660253.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1660253 = 7 ⋅237179.

It can be written as a sum of positive squares in 2 ways, for example, as 3352561 + 168100 = 1831^2 + 410^2 .

It is a cyclic number.

It is not a de Polignac number, because 3520661 - 2⁶ = 3520597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3520663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47540 + ... + 47613.

It is an arithmetic number, because the mean of its divisors is an integer number (903963).

Almost surely, 2^3520661 is an apocalyptic number.

It is an amenable number.

3520661 is a deficient number, since it is larger than the sum of its proper divisors (95191).

3520661 is an equidigital number, since it uses as much as digits as its factorization.

3520661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95190.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 3520661 is about 1876.3424527522. The cubic root of 3520661 is about 152.1276196208.

The spelling of 3520661 in words is "three million, five hundred twenty thousand, six hundred sixty-one".