3531661 has 4 divisors (see below), whose sum is σ = 4036192. Its totient is φ = 3027132.

The previous prime is 3531659. The next prime is 3531677. The reversal of 3531661 is 1661353.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3531661 - 2¹ = 3531659 is a prime.

It is a Duffinian number.

3531661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3531601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252255 + ... + 252268.

It is an arithmetic number, because the mean of its divisors is an integer number (1009048).

Almost surely, 2^3531661 is an apocalyptic number.

It is an amenable number.

3531661 is a deficient number, since it is larger than the sum of its proper divisors (504531).

3531661 is an equidigital number, since it uses as much as digits as its factorization.

3531661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504530.

The product of its digits is 1620, while the sum is 25.

The square root of 3531661 is about 1879.2714013681. The cubic root of 3531661 is about 152.2858914181.

The spelling of 3531661 in words is "three million, five hundred thirty-one thousand, six hundred sixty-one".