3811661 has 12 divisors (see below), whose sum is σ = 4481568. Its totient is φ = 3232152.

The previous prime is 3811657. The next prime is 3811669. The reversal of 3811661 is 1661183.

3811661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3811661 - 2² = 3811657 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3811661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3811669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4880 + ... + 5606.

It is an arithmetic number, because the mean of its divisors is an integer number (373464).

Almost surely, 2^3811661 is an apocalyptic number.

It is an amenable number.

3811661 is a deficient number, since it is larger than the sum of its proper divisors (669907).

3811661 is a wasteful number, since it uses less digits than its factorization.

3811661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848 (or 841 counting only the distinct ones).

The product of its digits is 864, while the sum is 26.

The square root of 3811661 is about 1952.3475612708. The cubic root of 3811661 is about 156.2085338499.

The spelling of 3811661 in words is "three million, eight hundred eleven thousand, six hundred sixty-one".