3666631 has 4 divisors (see below), whose sum is σ = 3671200. Its totient is φ = 3662064.

The previous prime is 3666629. The next prime is 3666647. The reversal of 3666631 is 1366663.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 3666631 - 2¹ = 3666629 is a prime.

It is a super-2 number, since 2×3666631² = 26888365780322, which contains 22 as substring.

It is a d-powerful number, because it can be written as 3 + 6⁵ + 6⁷ + 6⁸ + 6⁸ + 3⁹ + 1 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3666593 and 3666602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3666661) 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, 726 + ... + 2803.

It is an arithmetic number, because the mean of its divisors is an integer number (917800).

Almost surely, 2^3666631 is an apocalyptic number.

3666631 is a deficient number, since it is larger than the sum of its proper divisors (4569).

3666631 is a wasteful number, since it uses less digits than its factorization.

3666631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4568.

The product of its digits is 11664, while the sum is 31.

The square root of 3666631 is about 1914.8449023354. The cubic root of 3666631 is about 154.2016669823.

Subtracting from 3666631 its reverse (1366663), we obtain a cube (2299968 = 132³).

The spelling of 3666631 in words is "three million, six hundred sixty-six thousand, six hundred thirty-one".