3511661 has 4 divisors (see below), whose sum is σ = 3520032. Its totient is φ = 3503292.

The previous prime is 3511603. The next prime is 3511667. The reversal of 3511661 is 1661153.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1661153 = 13 ⋅127781.

It is a cyclic number.

It is not a de Polignac number, because 3511661 - 2¹⁴ = 3495277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3511667) 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, 3521 + ... + 4406.

It is an arithmetic number, because the mean of its divisors is an integer number (880008).

Almost surely, 2^3511661 is an apocalyptic number.

It is an amenable number.

3511661 is a deficient number, since it is larger than the sum of its proper divisors (8371).

3511661 is an equidigital number, since it uses as much as digits as its factorization.

3511661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8370.

The product of its digits is 540, while the sum is 23.

The square root of 3511661 is about 1873.9426351946. The cubic root of 3511661 is about 151.9978791255.

The spelling of 3511661 in words is "three million, five hundred eleven thousand, six hundred sixty-one".